Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:55:55 2013

Optimize a model with 480 rows, 4560 columns and 11180 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.02s
Presolved: 460 rows, 4540 columns, 10760 nonzeros
Variable types: 4440 continuous, 100 integer (100 binary)

Root relaxation: objective 3.860476e+04, 449 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    9          - 38604.7615     -      -    0s
     0     0 38633.7893    0   12          - 38633.7893     -      -    0s
     0     0 38635.4518    0   12          - 38635.4518     -      -    0s
     0     0 38636.6942    0   12          - 38636.6942     -      -    0s
     0     0 38637.0561    0   12          - 38637.0561     -      -    0s
     0     0 38637.3027    0   12          - 38637.3027     -      -    0s
     0     0 38637.5725    0   12          - 38637.5725     -      -    0s
     0     0 38637.5725    0   11          - 38637.5725     -      -    0s
H    0     0                    41517.346841 38637.5725  6.94%     -    0s
     0     2 38668.2671    0    9 41517.3468 38668.2671  6.86%     -    0s
*   22    13              20    39123.278436 38832.0602  0.74%  11.2    0s
H   27     6                    38860.914280 38842.4444  0.05%  10.8    0s

Cutting planes:
  Flow cover: 6

Explored 41 nodes (994 simplex iterations) in 0.34 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886091427998e+04, best bound 3.885875209612e+04, gap 0.0056%