Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:04:18 2013

Optimize a model with 21666 rows, 21206 columns and 84686 nonzeros
Presolve removed 1781 rows and 0 columns
Presolve time: 0.12s
Presolved: 19885 rows, 21206 columns, 81124 nonzeros
Variable types: 21160 continuous, 46 integer (46 binary)

Root relaxation: objective 5.663864e+04, 4255 iterations, 0.40 seconds

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

     0     0 56638.6436    0    2          - 56638.6436     -      -    0s
H    0     0                    56843.000000 56638.6436  0.36%     -    0s
H    0     0                    56648.000000 56638.6436  0.02%     -    0s
     0     0 56639.4631    0    3 56648.0000 56639.4631  0.02%     -    0s
     0     0 56639.4631    0    3 56648.0000 56639.4631  0.02%     -    0s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 0 nodes (4265 simplex iterations) in 0.92 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.664800000000e+04, best bound 5.664800000000e+04, gap 0.0%