Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:57:30 2013

Optimize a model with 32567 rows, 3364 columns and 99238 nonzeros
Presolve removed 2337 rows and 1689 columns
Presolve time: 0.21s
Presolved: 30230 rows, 1675 columns, 92560 nonzeros
Variable types: 34 continuous, 1641 integer (1641 binary)
Found heuristic solution: objective 78042.000000
Found heuristic solution: objective 73671.000000

Root relaxation: objective 5.286986e+04, 17325 iterations, 1.29 seconds

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

     0     0 52869.8571    0   13 73671.0000 52869.8571  28.2%     -    1s
H    0     0                    52878.000000 52869.8571  0.02%     -    1s
     0     0 52869.8571    0   20 52878.0000 52869.8571  0.02%     -    1s
     0     0 52869.8571    0   13 52878.0000 52869.8571  0.02%     -    2s
     0     0 52869.8571    0   20 52878.0000 52869.8571  0.02%     -    2s
     0     2 52869.8571    0   20 52878.0000 52869.8571  0.02%     -    2s
H  202   120                    52875.000000 52870.0000  0.01%  52.9    3s

Cutting planes:
  Gomory: 4
  Cover: 1
  MIR: 41
  GUB cover: 1
  Zero half: 17

Explored 202 nodes (31581 simplex iterations) in 3.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.287500000000e+04, best bound 5.287000000000e+04, gap 0.0095%