Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:58:34 2013

Optimize a model with 37881 rows, 3721 columns and 115351 nonzeros
Presolve removed 3896 rows and 1899 columns
Presolve time: 0.29s
Presolved: 33985 rows, 1822 columns, 103577 nonzeros
Variable types: 28 continuous, 1794 integer (1794 binary)
Found heuristic solution: objective 77573.000000

Root relaxation: objective 5.655242e+04, 9765 iterations, 0.72 seconds

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

     0     0 56552.4211    0   11 77573.0000 56552.4211  27.1%     -    1s
H    0     0                    56574.000000 56552.4211  0.04%     -    1s
H    0     0                    56567.000000 56552.4211  0.03%     -    1s
     0     0 56552.6904    0   27 56567.0000 56552.6904  0.03%     -    1s
     0     0 56552.6904    0   15 56567.0000 56552.6904  0.03%     -    1s
     0     0 56552.6904    0   37 56567.0000 56552.6904  0.03%     -    1s
H    0     0                    56565.000000 56552.6904  0.02%     -    1s
     0     2 56552.7009    0   37 56565.0000 56552.7009  0.02%     -    2s
H    1     2                    56564.000000 56552.7009  0.02%  12.0    2s
H    6     5                    56562.000000 56552.8693  0.02%   2.0    2s
H   12     9                    56560.000000 56553.3956  0.01%   1.0    2s
H   12     8                    56559.000000 56553.3956  0.01%   1.0    2s

Cutting planes:
  Gomory: 3
  Implied bound: 2
  MIR: 20
  Zero half: 1

Explored 12 nodes (13780 simplex iterations) in 2.44 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.655900000000e+04, best bound 5.655400000000e+04, gap 0.0088%