Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:57:21 2013

Optimize a model with 32567 rows, 3364 columns and 99238 nonzeros
Presolve removed 2461 rows and 1696 columns
Presolve time: 0.24s
Presolved: 30106 rows, 1668 columns, 91910 nonzeros
Variable types: 29 continuous, 1639 integer (1639 binary)
Found heuristic solution: objective 69460.000000

Root relaxation: objective 5.087291e+04, 12099 iterations, 0.76 seconds

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

     0     0 50872.9091    0   11 69460.0000 50872.9091  26.8%     -    1s
H    0     0                    50890.000000 50872.9091  0.03%     -    1s
H    0     0                    50883.000000 50872.9091  0.02%     -    1s
     0     0 50872.9091    0   23 50883.0000 50872.9091  0.02%     -    1s
     0     0 50872.9091    0   17 50883.0000 50872.9091  0.02%     -    1s
     0     0 50872.9374    0   36 50883.0000 50872.9374  0.02%     -    1s
H    0     0                    50881.000000 50872.9374  0.02%     -    1s
     0     2 50873.1818    0   36 50881.0000 50873.1818  0.02%     -    1s
H   16     9                    50880.000000 50873.3182  0.01%  28.3    1s

Cutting planes:
  Implied bound: 2
  MIR: 7

Explored 1764 nodes (29668 simplex iterations) in 2.56 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.088000000000e+04, best bound 5.087500000000e+04, gap 0.0098%