Wall clock time and date at job start Sat Apr 11 2020 06:11:50 AMSOL-version 7.1 by G. D. Hawkins, D. J. Giesen, G. C. Lynch, C. C. Chambers, I. Rossi, J. W. Storer, J. Li, J. D. Thompson, P. Winget, B. J. Lynch, D. Rinaldi, D. A. Liotard, C. J. Cramer, and D. G. Truhlar Copyright 2004 by Regents of the University of Minnesota. All rights reserved. Notice: recipients of this code are asked to comply with the user agreement in Section 1 of the documentation file. ******************************************************************************* * 1SCF - SCF CALCULATION WITHOUT GEOMETRY OPTIMIZATION * - USE EF ROUTINE FOR MINIMUM SEARCH (DEFAULT) * GEO-OK - OVERRIDE INTERATOMIC DISTANCE CHECK * TLIMIT= - A TIME OF 15. SECONDS REQUESTED * CHARGE - CHARGE ON SYSTEM= -1 * AM1 - THE AM1 HAMILTONIAN TO BE USED * DEV - DEVELOPER OPTIONS ARE ALLOWED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS USER-SPECIFIED * DIELEC - THE SOLVENT DIELECTRIC CONSTANT IS 2.06 * IOFR - THE SOLVENT INDEX OF REFRACTION IS 1.4345 * ALPHA - THE SOLVENT ALPHA IS 0.00 * BETA - THE SOLVENT BETA IS 0.00 * GAMMA - THE SOLVENT MACROSCOPIC SURFACE TENSION IS * 38.93 CAL MOL^-1 ANGSTROM^-2 * FACARB - THE FRACTION OF AROMATIC CARBONS IS 0.00 * FEHALO - THE FRACTION OF ELECTRONEGATIVE HALOGENS IS 0.00 ******************************************************************************* Atom NO. Chemical Bond length Bond angle Dihedral angle number (k) symbol (angstroms) (degrees) (degrees) (I) NA:I NB:NA:I NC:NB:NA:I NA NB NC 1 1 C 2 2 O 1.42899 * 1 3 3 C 1.42900 * 113.99875 * 2 1 4 4 C 1.53002 * 109.47367 * 179.97438 * 3 2 1 5 5 C 1.50699 * 109.61560 * 306.47200 * 4 3 2 6 6 O 1.21277 * 119.99789 * 121.64614 * 5 4 3 7 7 N 1.34776 * 120.00304 * 301.65048 * 5 4 3 8 8 C 1.47022 * 125.64296 * 5.64747 * 7 5 4 9 9 C 1.54329 * 107.26680 * 181.02308 * 8 7 5 10 10 H 1.09010 * 110.71695 * 140.55931 * 9 8 7 11 11 C 1.53004 * 110.72238 * 263.65262 * 9 8 7 12 12 C 1.55151 * 102.94175 * 22.19767 * 9 8 7 13 13 H 1.09000 * 111.00767 * 82.57292 * 12 9 8 14 14 C 1.52998 * 111.00379 * 206.38386 * 12 9 8 15 15 N 1.46497 * 109.47488 * 184.99718 * 14 12 9 16 16 C 1.36935 * 120.00367 * 179.97438 * 15 14 12 17 17 H 1.07997 * 120.00046 * 359.97438 * 16 15 14 18 18 C 1.38812 * 120.00210 * 180.02562 * 16 15 14 19 19 N 1.31622 * 120.00150 * 0.02562 * 18 16 15 20 20 Si 1.86806 * 120.00119 * 180.02562 * 18 16 15 21 21 H 1.48498 * 109.46949 * 359.97438 * 20 18 16 22 22 H 1.48502 * 109.46909 * 119.99989 * 20 18 16 23 23 H 1.48500 * 109.46965 * 240.00169 * 20 18 16 24 24 C 1.47419 * 125.64912 * 185.34291 * 7 5 4 25 25 C 1.53172 * 109.54413 * 186.24817 * 4 3 2 26 26 C 1.53099 * 109.21307 * 183.18704 * 25 4 3 27 27 O 1.42901 * 109.41436 * 57.57660 * 26 25 4 28 28 C 1.42897 * 114.09793 * 298.84425 * 27 26 25 29 29 C 1.53083 * 109.41913 * 61.15769 * 28 27 26 30 30 H 1.08997 * 109.47488 * 299.99763 * 1 2 3 31 31 H 1.09007 * 109.46906 * 60.00157 * 1 2 3 32 32 H 1.09000 * 109.46758 * 179.97438 * 1 2 3 33 33 H 1.09002 * 109.46972 * 60.00074 * 3 2 1 34 34 H 1.08997 * 109.47081 * 300.00314 * 3 2 1 35 35 H 1.08992 * 109.88910 * 300.44098 * 8 7 5 36 36 H 1.09007 * 109.88265 * 61.61153 * 8 7 5 37 37 H 1.08993 * 109.46921 * 58.55052 * 11 9 8 38 38 H 1.09001 * 109.46807 * 178.54967 * 11 9 8 39 39 H 1.09003 * 109.46698 * 298.54610 * 11 9 8 40 40 H 1.09001 * 109.47080 * 304.99964 * 14 12 9 41 41 H 1.09003 * 109.47375 * 64.99492 * 14 12 9 42 42 H 0.97005 * 119.99731 * 0.02562 * 15 14 12 43 43 H 0.97000 * 120.00149 * 180.02562 * 19 18 16 44 44 H 1.09004 * 110.36694 * 274.74279 * 24 7 5 45 45 H 1.08997 * 110.36594 * 37.06932 * 24 7 5 46 46 H 1.08995 * 109.52421 * 63.25163 * 25 4 3 47 47 H 1.09005 * 109.52475 * 303.12271 * 25 4 3 48 48 H 1.08998 * 109.48052 * 177.56458 * 26 25 4 49 49 H 1.09000 * 109.47692 * 297.58378 * 26 25 4 50 50 H 1.09002 * 109.47877 * 181.14669 * 28 27 26 51 51 H 1.09004 * 109.47902 * 301.16353 * 28 27 26 52 52 H 1.09001 * 109.52139 * 62.29564 * 29 28 27 53 53 H 1.09001 * 109.52673 * 182.42297 * 29 28 27 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 6 0.0000 0.0000 0.0000 2 8 1.4290 0.0000 0.0000 3 6 2.0102 1.3055 0.0000 4 6 3.5354 1.1848 0.0006 5 6 3.9727 0.3039 1.1425 6 8 4.6184 -0.6988 0.9220 7 7 3.6463 0.6302 2.4087 8 6 2.7746 1.7445 2.8087 9 6 2.7112 1.7459 4.3507 10 1 2.7300 2.7652 4.7365 11 6 1.4651 1.0062 4.8419 12 6 4.0012 0.9831 4.7522 13 1 4.8655 1.6470 4.7464 14 6 3.8386 0.3112 6.1171 15 7 5.1102 -0.2968 6.5167 16 6 5.2070 -0.9589 7.7114 17 1 4.3461 -1.0325 8.3593 18 6 6.4120 -1.5345 8.0903 19 7 7.4617 -1.4436 7.3013 20 14 6.5440 -2.4383 9.7198 21 1 5.2328 -2.3980 10.4157 22 1 6.9305 -3.8507 9.4726 23 1 7.5736 -1.7842 10.5666 24 6 4.0990 -0.0748 3.6217 25 6 4.1594 2.5748 0.1577 26 6 5.6836 2.4548 0.0776 27 8 6.0479 1.8522 -1.1658 28 6 5.5331 0.5315 -1.3471 29 6 4.0030 0.5741 -1.3242 30 1 -0.3634 0.5138 0.8900 31 1 -0.3633 0.5138 -0.8901 32 1 -0.3633 -1.0277 -0.0005 33 1 1.6885 1.8464 0.8900 34 1 1.6885 1.8464 -0.8899 35 1 3.1914 2.6871 2.4541 36 1 1.7757 1.6002 2.3968 37 1 1.4807 -0.0183 4.4702 38 1 1.4541 0.9971 5.9318 39 1 0.5731 1.5129 4.4737 40 1 3.5440 1.0563 6.8561 41 1 3.0712 -0.4603 6.0533 42 1 5.8837 -0.2298 5.9352 43 1 8.3036 -1.8461 7.5659 44 1 3.4465 -0.9218 3.8340 45 1 5.1297 -0.4091 3.5037 46 1 3.8773 2.9936 1.1237 47 1 3.8029 3.2264 -0.6400 48 1 6.1303 3.4467 0.1456 49 1 6.0433 1.8370 0.9004 50 1 5.8716 0.1378 -2.3055 51 1 5.8910 -0.1117 -0.5431 52 1 3.6432 1.1844 -2.1525 53 1 3.6089 -0.4377 -1.4192 RHF calculation, no. of doubly occupied orbitals= 66 REFERENCES FOR PARAMETERS IN GAS-PHASE HAMILTONIAN: H: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) C: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) N: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) O: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) Si: (AM1): M.J.S.DEWAR, C. JIE, ORGANOMETALLICS, 6, 1486-1490 (1987). REFERENCE FOR CHARGE MODEL 2: J. Li, J. Xing, C. J. Cramer, and D. G. Truhlar, J. Chem. Phys. 111 (1999) 885. REFERENCE FOR THE PARAMETERIZATION OF THE SM5.42R SOLVATION MODEL: J. Li, T. Zhu, G. D. Hawkins, P. Winget, D. A. Liotard, C. J. Cramer, and D. G. Truhlar, Theor. Chem. Acc. 103 (1999) 9-63 P. Winget, J. D. Thompson C. J. Cramer,and D. G. Truhlar, J. Phys. Chem. B. submitted. CHARGE=-1 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=GENORG IOFR=1.4345 ALPHA=0.00 BETA=0.00 GAMMA=38.93 & DIELEC=2.06 FACARB=0.00 FEHALO=0.00 DEV ZINC001716984891.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Apr 11 2020 06:11:50 Heat of formation + Delta-G solvation = -104.993872 kcal Electronic energy + Delta-G solvation = -32595.947510 eV Core-core repulsion = 28468.432376 eV Total energy + Delta-G solvation = -4127.515135 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.75 seconds Orbital eigenvalues (eV) -41.29654 -39.13135 -37.98545 -37.50627 -34.86488 -34.30098 -32.78826 -31.19442 -31.18234 -29.17267 -28.36975 -26.82683 -26.35097 -25.48563 -23.99830 -23.69047 -22.82961 -21.89868 -21.16698 -19.25812 -18.91799 -17.17936 -16.89250 -16.71408 -16.49054 -16.16887 -16.06525 -15.73081 -15.50474 -14.97796 -14.65657 -14.55063 -14.37126 -13.92702 -13.74668 -13.58337 -13.38964 -13.12542 -12.83815 -12.66967 -12.60405 -12.44162 -12.34727 -12.12364 -11.92811 -11.84869 -11.60604 -11.52500 -11.38214 -11.04886 -10.85268 -10.82248 -10.62836 -10.48582 -10.41404 -10.32208 -10.00580 -9.93176 -9.71351 -9.66961 -9.31206 -8.87028 -8.48579 -6.91666 -5.75113 -3.04397 2.68732 3.00199 3.35979 3.44459 3.49628 3.52267 3.79944 4.13460 4.39803 4.45131 4.48969 4.57169 4.64703 4.69959 4.78596 4.90495 4.93447 4.99492 5.03234 5.08949 5.13634 5.15679 5.34219 5.38869 5.40009 5.42414 5.48619 5.49866 5.52206 5.58580 5.60317 5.69429 5.74548 5.82447 5.87376 5.94782 5.96064 6.03246 6.06499 6.14958 6.21162 6.33956 6.40517 6.47264 6.68307 6.80725 6.82484 7.11825 7.62760 7.70999 8.26071 8.43081 9.54423 10.11554 10.45644 11.47630 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.013691 B = 0.003131 C = 0.002820 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2044.659694 B = 8939.955969 C = 9928.071119 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.032 3.968 2 O -0.381 6.381 3 C 0.061 3.939 4 C -0.073 4.073 5 C 0.548 3.452 6 O -0.530 6.530 7 N -0.612 5.612 8 C 0.094 3.906 9 C -0.098 4.098 10 H 0.088 0.912 11 C -0.144 4.144 12 C -0.101 4.101 13 H 0.085 0.915 14 C 0.166 3.834 15 N -0.733 5.733 16 C -0.241 4.241 17 H 0.070 0.930 18 C -0.013 4.013 19 N -0.931 5.931 20 Si 0.906 3.094 21 H -0.280 1.280 22 H -0.291 1.291 23 H -0.292 1.292 24 C 0.119 3.881 25 C -0.151 4.151 26 C 0.061 3.939 27 O -0.384 6.384 28 C 0.047 3.953 29 C -0.123 4.123 30 H 0.041 0.959 31 H 0.040 0.960 32 H 0.087 0.913 33 H 0.067 0.933 34 H 0.059 0.941 35 H 0.070 0.930 36 H 0.071 0.929 37 H 0.058 0.942 38 H 0.067 0.933 39 H 0.050 0.950 40 H 0.023 0.977 41 H 0.025 0.975 42 H 0.384 0.616 43 H 0.255 0.745 44 H 0.070 0.930 45 H 0.081 0.919 46 H 0.087 0.913 47 H 0.084 0.916 48 H 0.098 0.902 49 H 0.053 0.947 50 H 0.092 0.908 51 H 0.080 0.920 52 H 0.072 0.928 53 H 0.087 0.913 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -14.831 11.801 -17.905 26.073 Note: The Mulliken population analysis charges presented below were not used in the solvation calculation but are provided for completeness. The chosen solvation model uses CM2 partial charges for calculating solvation energies. Net atomic charges, atomic populations, and dipole contributions using Mulliken population analysis Atom NO. Type Charge No. of electrons 1 C -0.064 4.064 2 O -0.299 6.299 3 C -0.016 4.016 4 C -0.077 4.077 5 C 0.335 3.665 6 O -0.406 6.406 7 N -0.346 5.346 8 C -0.029 4.029 9 C -0.117 4.117 10 H 0.107 0.893 11 C -0.201 4.201 12 C -0.120 4.120 13 H 0.103 0.897 14 C 0.038 3.962 15 N -0.378 5.378 16 C -0.372 4.372 17 H 0.088 0.912 18 C -0.209 4.209 19 N -0.580 5.580 20 Si 0.737 3.263 21 H -0.206 1.206 22 H -0.218 1.218 23 H -0.219 1.219 24 C -0.003 4.003 25 C -0.188 4.188 26 C -0.016 4.016 27 O -0.303 6.303 28 C -0.030 4.030 29 C -0.161 4.161 30 H 0.060 0.940 31 H 0.059 0.941 32 H 0.105 0.895 33 H 0.084 0.916 34 H 0.077 0.923 35 H 0.088 0.912 36 H 0.088 0.912 37 H 0.077 0.923 38 H 0.086 0.914 39 H 0.069 0.931 40 H 0.041 0.959 41 H 0.042 0.958 42 H 0.217 0.783 43 H 0.065 0.935 44 H 0.088 0.912 45 H 0.099 0.901 46 H 0.105 0.895 47 H 0.103 0.897 48 H 0.116 0.884 49 H 0.071 0.929 50 H 0.110 0.890 51 H 0.098 0.902 52 H 0.091 0.909 53 H 0.106 0.894 Dipole moment (debyes) X Y Z Total from point charges -14.283 11.074 -18.082 25.566 hybrid contribution -0.174 -0.354 0.940 1.020 sum -14.457 10.720 -17.142 24.855 Atomic orbital electron populations 1.22748 0.80819 1.03025 0.99821 1.87979 1.19732 1.26878 1.95346 1.22806 0.91449 0.85847 1.01476 1.20868 0.94822 0.96289 0.95696 1.19741 0.79271 0.85393 0.82050 1.90660 1.40230 1.26456 1.83240 1.48439 1.48948 1.31559 1.05649 1.22573 0.94305 0.90003 0.96008 1.22211 0.96112 1.00530 0.92865 0.89339 1.21832 0.95614 1.00497 1.02148 1.22652 0.97023 0.96664 0.95688 0.89664 1.20624 0.90340 0.94624 0.90609 1.42388 1.07943 1.65209 1.22217 1.19240 0.95839 1.26564 0.95526 0.91155 1.24745 0.95952 1.01540 0.98639 1.69670 1.01196 1.49858 1.37241 0.86136 0.77339 0.79374 0.83443 1.20573 1.21848 1.21890 1.22349 1.01121 0.94865 0.81953 1.22404 0.97630 0.94668 1.04104 1.22527 0.92913 0.98968 0.87195 1.87888 1.74463 1.30470 1.37447 1.22899 0.92459 0.84296 1.03304 1.21973 0.97410 1.02560 0.94175 0.94014 0.94099 0.89463 0.91572 0.92330 0.91181 0.91156 0.92262 0.91381 0.93071 0.95945 0.95753 0.78279 0.93528 0.91220 0.90086 0.89456 0.89702 0.88361 0.92862 0.89017 0.90182 0.90903 0.89449 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 13. Note: The number of geometries may not correspond to the number of cycles due to rejected geometry changes. In the following table subtotal= G_P + SS G_CDS. Atom Chem. CM2 G_P Area Sigma k SS G_CDS Subtotal M number symbol chg. (kcal) (Ang**2) cal/(Ang**2) (kcal) (kcal) value 1 C 0.03 0.25 11.01 101.05 1.11 1.36 16 2 O -0.38 -4.33 9.83 -35.23 -0.35 -4.67 16 3 C 0.06 0.56 4.39 37.16 0.16 0.72 16 4 C -0.07 -0.82 0.34 -155.47 -0.05 -0.87 16 5 C 0.55 8.17 4.76 -10.99 -0.05 8.12 16 6 O -0.53 -10.00 14.09 5.56 0.08 -9.92 16 7 N -0.61 -8.50 3.31 -170.38 -0.56 -9.07 16 8 C 0.09 0.96 4.78 -3.06 -0.01 0.94 16 9 C -0.10 -1.08 3.46 -88.78 -0.31 -1.39 16 10 H 0.09 0.84 8.14 -51.92 -0.42 0.42 16 11 C -0.14 -1.54 7.91 37.16 0.29 -1.25 16 12 C -0.10 -1.53 2.93 -88.35 -0.26 -1.79 16 13 H 0.09 1.35 8.14 -51.93 -0.42 0.93 16 14 C 0.17 3.16 4.54 -4.04 -0.02 3.14 16 15 N -0.73 -18.33 5.55 -59.91 -0.33 -18.66 16 16 C -0.24 -6.71 9.99 -15.06 -0.15 -6.86 16 17 H 0.07 1.90 7.83 -52.49 -0.41 1.49 16 18 C -0.01 -0.37 5.50 -17.43 -0.10 -0.46 16 19 N -0.93 -28.44 13.06 55.49 0.72 -27.72 16 20 Si 0.91 22.53 29.55 -169.99 -5.02 17.51 16 21 H -0.28 -6.72 7.11 56.52 0.40 -6.32 16 22 H -0.29 -7.32 7.11 56.52 0.40 -6.91 16 23 H -0.29 -7.28 7.11 56.52 0.40 -6.87 16 24 C 0.12 1.97 5.99 -2.41 -0.01 1.95 16 25 C -0.15 -1.37 4.80 -26.59 -0.13 -1.50 16 26 C 0.06 0.68 6.62 37.21 0.25 0.92 16 27 O -0.38 -4.97 10.77 -35.23 -0.38 -5.35 16 28 C 0.05 0.59 6.55 37.20 0.24 0.83 16 29 C -0.12 -1.41 4.44 -26.59 -0.12 -1.53 16 30 H 0.04 0.28 8.14 -51.93 -0.42 -0.14 16 31 H 0.04 0.25 8.14 -51.92 -0.42 -0.17 16 32 H 0.09 0.64 8.14 -51.93 -0.42 0.21 16 33 H 0.07 0.53 4.56 -51.93 -0.24 0.29 16 34 H 0.06 0.43 8.14 -51.93 -0.42 0.01 16 35 H 0.07 0.59 5.29 -51.93 -0.27 0.31 16 36 H 0.07 0.64 5.46 -51.93 -0.28 0.36 16 37 H 0.06 0.72 7.35 -51.93 -0.38 0.34 16 38 H 0.07 0.77 7.13 -51.93 -0.37 0.40 16 39 H 0.05 0.43 8.14 -51.93 -0.42 0.01 16 40 H 0.02 0.43 8.05 -51.93 -0.42 0.01 16 41 H 0.02 0.47 6.95 -51.93 -0.36 0.11 16 42 H 0.38 10.20 7.67 -40.82 -0.31 9.89 16 43 H 0.25 7.53 8.31 -40.82 -0.34 7.19 16 44 H 0.07 1.24 7.48 -51.93 -0.39 0.85 16 45 H 0.08 1.58 8.09 -51.93 -0.42 1.16 16 46 H 0.09 0.69 4.80 -51.93 -0.25 0.44 16 47 H 0.08 0.63 8.14 -51.93 -0.42 0.21 16 48 H 0.10 0.88 8.14 -51.93 -0.42 0.46 16 49 H 0.05 0.71 7.38 -51.93 -0.38 0.32 16 50 H 0.09 0.99 8.14 -51.93 -0.42 0.57 16 51 H 0.08 1.24 5.76 -51.93 -0.30 0.94 16 52 H 0.07 0.70 8.14 -51.93 -0.42 0.27 16 53 H 0.09 1.12 7.87 -51.93 -0.41 0.71 16 LS Contribution 395.05 15.07 5.95 5.95 Total: -1.00 -34.07 395.05 -8.03 -42.10 By element: Atomic # 1 Polarization: 16.46 SS G_CDS: -8.98 Total: 7.48 kcal Atomic # 6 Polarization: 1.51 SS G_CDS: 0.85 Total: 2.36 kcal Atomic # 7 Polarization: -55.28 SS G_CDS: -0.17 Total: -55.45 kcal Atomic # 8 Polarization: -19.30 SS G_CDS: -0.65 Total: -19.95 kcal Atomic # 14 Polarization: 22.53 SS G_CDS: -5.02 Total: 17.51 kcal Total LS contribution 5.95 Total: 5.95 kcal Total: -34.07 -8.03 -42.10 kcal The number of atoms in the molecule is 53 The average number of expansion shells was 16.00 The maximum number of expansion shells was 16 The minimum number of expansion shells was 16 **** NOTA BENE **** This is the net solvation energy for this exact molecular structure (nuclear and electronic)! The standard-state solvation energy should be obtained as the difference between the heat of formation plus delta-G solvation for the relaxed solvated system and that for the relaxed gas-phase system. ZINC001716984891.mol2 53 1SCF run This is a breakdown of the solvation energy calculated without geometric relaxation in solution: (1) E-EN(sol) electronic-nuclear energy of solute -62.898 kcal (2) G-P(sol) polarization free energy of solvation -34.071 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -96.968 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.026 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.096 kcal (6) G-S(sol) free energy of system = (1) + (5) -104.994 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.75 seconds