Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:37 2013

Optimize a model with 640 rows, 2520 columns and 6010 nonzeros
Presolve removed 20 rows and 30 columns
Presolve time: 0.03s
Presolved: 620 rows, 2490 columns, 4980 nonzeros
Variable types: 2000 continuous, 490 integer (490 binary)

Root relaxation: objective 1.937272e+04, 107 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 19372.7157    0    2          - 19372.7157     -      -    0s
     0     0 19377.6036    0    4          - 19377.6036     -      -    0s
     0     0 19377.9410    0    4          - 19377.9410     -      -    0s
     0     0 19377.9410    0    4          - 19377.9410     -      -    0s
H    0     0                    19889.154033 19377.9410  2.57%     -    0s
     0     2 19389.9916    0    4 19889.1540 19389.9916  2.51%     -    0s
*   26    26              25    19548.823224 19447.3227  0.52%   1.6    0s
H   28    22                    19546.959664 19447.3227  0.51%   1.5    0s
*   31    22              25    19546.213142 19447.3227  0.51%   1.6    0s
H   82    23                    19516.075490 19456.1147  0.31%   1.6    0s
*  116    28              12    19515.429393 19466.9477  0.25%   1.7    0s
*  148    27               6    19514.510092 19494.1227  0.10%   1.8    0s
*  153    23               7    19513.935414 19494.1227  0.10%   1.8    0s
*  155    22               7    19513.720614 19494.1227  0.10%   1.8    0s

Cutting planes:
  Gomory: 2
  Flow cover: 2

Explored 189 nodes (565 simplex iterations) in 0.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.951372061361e+04, best bound 1.951187055826e+04, gap 0.0095%