Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:39:53 2013

Optimize a model with 39122 rows, 38502 columns and 153822 nonzeros
Presolve removed 3197 rows and 0 columns
Presolve time: 0.23s
Presolved: 35925 rows, 38502 columns, 147428 nonzeros
Variable types: 38440 continuous, 62 integer (62 binary)

Root relaxation: objective 5.649705e+04, 5412 iterations, 0.78 seconds

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

     0     0 56497.0506    0    2          - 56497.0506     -      -    1s
H    0     0                    56875.000000 56497.0506  0.66%     -    1s
     0     0 56497.4578    0    3 56875.0000 56497.4578  0.66%     -    1s
H    0     0                    56674.000000 56497.4578  0.31%     -    1s
     0     0 56497.7469    0    3 56674.0000 56497.7469  0.31%     -    1s
     0     0 56497.7469    0    2 56674.0000 56497.7469  0.31%     -    2s
     0     0 56497.7469    0    3 56674.0000 56497.7469  0.31%     -    2s
     0     0 56497.7469    0    3 56674.0000 56497.7469  0.31%     -    3s
     0     2 56502.0555    0    3 56674.0000 56502.0555  0.30%     -    3s
*   16    10              12    56643.000000 56539.4563  0.18%  28.5    4s
*   22     4               6    56612.000000 56543.2927  0.12%  28.0    4s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 39 nodes (8842 simplex iterations) in 4.45 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.661200000000e+04, best bound 5.660933333333e+04, gap 0.0047%