Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:56:19 2013

Optimize a model with 27775 rows, 3025 columns and 84700 nonzeros
Presolve removed 3378 rows and 1555 columns
Presolve time: 0.21s
Presolved: 24397 rows, 1470 columns, 74281 nonzeros
Variable types: 21 continuous, 1449 integer (1449 binary)
Found heuristic solution: objective 72003.000000

Root relaxation: objective 5.759988e+04, 6908 iterations, 0.42 seconds

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

     0     0 57599.8835    0    9 72003.0000 57599.8835  20.0%     -    0s
H    0     0                    57610.000000 57599.8835  0.02%     -    0s
     0     0 57601.5350    0   19 57610.0000 57601.5350  0.01%     -    0s
     0     0 57601.5350    0    9 57610.0000 57601.5350  0.01%     -    0s
H    0     0                    57608.000000 57601.5350  0.01%     -    0s
     0     0 57601.7871    0   21 57608.0000 57601.7871  0.01%     -    0s
     0     1 57602.1226    0   21 57608.0000 57602.1226  0.01%     -    0s

Cutting planes:
  Gomory: 6
  Cover: 3
  Implied bound: 2
  MIR: 10
  GUB cover: 1

Explored 4 nodes (7153 simplex iterations) in 0.93 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.760800000000e+04, best bound 5.760300000000e+04, gap 0.0087%