Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:59:52 2013

Optimize a model with 41727 rows, 3969 columns and 127008 nonzeros
Presolve removed 3235 rows and 2006 columns
Presolve time: 0.32s
Presolved: 38492 rows, 1963 columns, 117334 nonzeros
Variable types: 31 continuous, 1932 integer (1932 binary)
Found heuristic solution: objective 72240.000000

Root relaxation: objective 5.127907e+04, 12716 iterations, 1.03 seconds

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

     0     0 51279.0714    0   18 72240.0000 51279.0714  29.0%     -    1s
H    0     0                    51300.000000 51279.0714  0.04%     -    1s
H    0     0                    51288.000000 51279.0714  0.02%     -    1s
H    0     0                    51286.000000 51279.0714  0.01%     -    1s
     0     0 51280.0000    0   11 51286.0000 51280.0000  0.01%     -    1s
     0     0 51280.0000    0   12 51286.0000 51280.0000  0.01%     -    2s
     0     0 51280.0000    0   23 51286.0000 51280.0000  0.01%     -    2s
     0     0 51280.0000    0   31 51286.0000 51280.0000  0.01%     -    2s
     0     0 51280.0000    0   13 51286.0000 51280.0000  0.01%     -    2s
H    0     0                    51283.000000 51280.0000  0.01%     -    2s

Cutting planes:
  Gomory: 1
  MIR: 6

Explored 0 nodes (17432 simplex iterations) in 2.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.128300000000e+04, best bound 5.128000000000e+04, gap 0.0058%