Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:10 2013

Optimize a model with 31976 rows, 31416 columns and 125496 nonzeros
Presolve removed 2875 rows and 0 columns
Presolve time: 0.17s
Presolved: 29101 rows, 31416 columns, 119746 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 5.349714e+04, 4142 iterations, 0.48 seconds

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

     0     0 53497.1426    0    2          - 53497.1426     -      -    0s
H    0     0                    53548.000000 53497.1426  0.09%     -    0s
     0     0 53498.3913    0    4 53548.0000 53498.3913  0.09%     -    0s
     0     0 53498.3913    0    4 53548.0000 53498.3913  0.09%     -    1s
     0     0 53498.3913    0    2 53548.0000 53498.3913  0.09%     -    1s
     0     0 53498.9314    0    3 53548.0000 53498.9314  0.09%     -    1s
     0     0 53498.9314    0    3 53548.0000 53498.9314  0.09%     -    1s
     0     0 53498.9314    0    3 53548.0000 53498.9314  0.09%     -    1s
     0     0 53526.1765    0    1 53548.0000 53526.1765  0.04%     -    2s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 0 nodes (5828 simplex iterations) in 2.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.354800000000e+04, best bound 5.354800000000e+04, gap 0.0%