Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:16:05 2013

Optimize a model with 440 rows, 4760 columns and 10980 nonzeros
Presolve removed 20 rows and 260 columns
Presolve time: 0.01s
Presolved: 420 rows, 4500 columns, 10580 nonzeros
Variable types: 4420 continuous, 80 integer (80 binary)

Root relaxation: objective 3.860476e+04, 556 iterations, 0.01 seconds

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

     0     0 38604.7615    0    6          - 38604.7615     -      -    0s
     0     0 38648.1782    0    6          - 38648.1782     -      -    0s
     0     0 38658.9499    0    6          - 38658.9499     -      -    0s
     0     0 38662.3029    0    6          - 38662.3029     -      -    0s
     0     0 38662.4047    0    6          - 38662.4047     -      -    0s
     0     0 38662.6497    0    6          - 38662.6497     -      -    0s
     0     0 38663.3717    0    6          - 38663.3717     -      -    0s
     0     0 38663.8153    0    6          - 38663.8153     -      -    0s
     0     0 38663.8668    0    6          - 38663.8668     -      -    0s
     0     0 38664.0013    0    6          - 38664.0013     -      -    0s
     0     0 38664.0013    0    6          - 38664.0013     -      -    0s
H    0     0                    39165.291803 38664.0013  1.28%     -    0s
     0     2 38666.4758    0    6 39165.2918 38666.4758  1.27%     -    0s
*   16    11              14    39062.024148 38777.3330  0.73%  15.9    0s
*   23     4               6    38860.606169 38855.6599  0.01%  13.4    0s

Cutting planes:
  Flow cover: 9

Explored 26 nodes (1168 simplex iterations) in 0.24 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886060616871e+04, best bound 3.885875209612e+04, gap 0.0048%