Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:53:41 2013

Optimize a model with 640 rows, 14240 columns and 118620 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.22s
Presolved: 620 rows, 14220 columns, 108600 nonzeros
Variable types: 14040 continuous, 180 integer (180 binary)

Root relaxation: objective 3.860476e+04, 541 iterations, 0.02 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 38606.1373    0    9          - 38606.1373     -      -    0s
     0     0 38606.1471    0    9          - 38606.1471     -      -    0s
     0     0 38606.1471    0    9          - 38606.1471     -      -    0s
     0     2 38607.4974    0    9          - 38607.4974     -      -    2s
*   16     7              15    38863.658936 38629.7362  0.60%  12.1    2s
*   43    12              20    38862.944125 38629.9445  0.60%   7.6    2s
*  108    15              22    38861.560495 38858.4651  0.01%   6.6    3s

Cutting planes:
  Flow cover: 5

Explored 109 nodes (1431 simplex iterations) in 3.16 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886156049461e+04, best bound 3.885846513738e+04, gap 0.0080%