Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:59 2013

Optimize a model with 616 rows, 31416 columns and 62776 nonzeros
Presolve time: 0.04s
Presolved: 616 rows, 31416 columns, 62776 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 5.602019e+04, 1149 iterations, 0.03 seconds

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

     0     0 56020.1939    0    7          - 56020.1939     -      -    0s
H    0     0                    57224.000000 56020.1939  2.10%     -    0s
H    0     0                    56872.000000 56020.1939  1.50%     -    0s
     0     0 56787.1750    0    5 56872.0000 56787.1750  0.15%     -    0s
     0     0 56814.4935    0    5 56872.0000 56814.4935  0.10%     -    0s
     0     0 56814.4935    0    7 56872.0000 56814.4935  0.10%     -    0s
     0     0 56814.4935    0    5 56872.0000 56814.4935  0.10%     -    0s
     0     0 56814.6257    0    5 56872.0000 56814.6257  0.10%     -    0s
     0     0 56825.6971    0    4 56872.0000 56825.6971  0.08%     -    0s
     0     0 56830.5390    0    4 56872.0000 56830.5390  0.07%     -    0s
     0     0 56831.5726    0    3 56872.0000 56831.5726  0.07%     -    0s
H    0     0                    56865.000000 56831.5726  0.06%     -    0s
     0     1 56835.2363    0    3 56865.0000 56835.2363  0.05%     -    0s

Cutting planes:
  Implied bound: 119
  Flow cover: 13

Explored 3 nodes (2896 simplex iterations) in 0.74 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.686500000000e+04, best bound 5.686239044974e+04, gap 0.0046%