Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:16:11 2013

Optimize a model with 520 rows, 4460 columns and 9500 nonzeros
Presolve removed 40 rows and 40 columns
Presolve time: 0.02s
Presolved: 480 rows, 4420 columns, 9360 nonzeros
Variable types: 4240 continuous, 180 integer (180 binary)

Root relaxation: objective 3.860476e+04, 451 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    3          - 38604.7615     -      -    0s
     0     0 38650.2754    0    3          - 38650.2754     -      -    0s
     0     0 38660.1528    0    3          - 38660.1528     -      -    0s
     0     0 38664.3819    0    3          - 38664.3819     -      -    0s
     0     0 38664.4104    0    3          - 38664.4104     -      -    0s
     0     0 38664.9652    0    3          - 38664.9652     -      -    0s
     0     0 38666.1735    0    3          - 38666.1735     -      -    0s
     0     0 38667.0791    0    3          - 38667.0791     -      -    0s
     0     0 38667.3534    0    3          - 38667.3534     -      -    0s
     0     0 38667.4250    0    3          - 38667.4250     -      -    0s
     0     0 38667.4250    0    3          - 38667.4250     -      -    0s
H    0     0                    39165.291803 38667.4250  1.27%     -    0s
     0     2 38676.7056    0    3 39165.2918 38676.7056  1.25%     -    0s
*   21     8               6    38860.427834 38825.2809  0.09%  17.6    0s

Cutting planes:
  Gomory: 2
  Flow cover: 16

Explored 32 nodes (1018 simplex iterations) in 0.23 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886042783404e+04, best bound 3.886042783404e+04, gap 0.0%