Gurobi 5.0.1 (linux64) logging started Wed Apr 24 00:58:40 2013

Optimize a model with 16440 rows, 16040 columns and 64040 nonzeros
Presolve removed 1013 rows and 0 columns
Presolve time: 0.09s
Presolved: 15427 rows, 16040 columns, 62014 nonzeros
Variable types: 16000 continuous, 40 integer (40 binary)

Root relaxation: objective 4.047031e+04, 2231 iterations, 0.18 seconds

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

     0     0 40470.3072    0    4          - 40470.3072     -      -    0s
H    0     0                    41198.000000 40470.3072  1.77%     -    0s
H    0     0                    40676.000000 40470.3072  0.51%     -    0s
     0     0 40476.2948    0    6 40676.0000 40476.2948  0.49%     -    0s
     0     0 40476.2948    0    6 40676.0000 40476.2948  0.49%     -    0s
     0     0 40476.2948    0    6 40676.0000 40476.2948  0.49%     -    0s
     0     0 40477.3744    0    4 40676.0000 40477.3744  0.49%     -    0s
     0     2 40479.8223    0    4 40676.0000 40479.8223  0.48%     -    1s
*    4     3               3    40627.000000 40623.6000  0.01%  54.0    1s

Cutting planes:
  Gomory: 1
  Flow cover: 7

Explored 5 nodes (2504 simplex iterations) in 1.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.062700000000e+04, best bound 4.062360000000e+04, gap 0.0084%