Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:54:45 2013

Optimize a model with 20875 rows, 2500 columns and 63750 nonzeros
Presolve removed 1954 rows and 1264 columns
Presolve time: 0.14s
Presolved: 18921 rows, 1236 columns, 57985 nonzeros
Variable types: 26 continuous, 1210 integer (1210 binary)
Found heuristic solution: objective 56408.000000

Root relaxation: objective 3.994404e+04, 8609 iterations, 0.44 seconds

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

     0     0 39944.0411    0   12 56408.0000 39944.0411  29.2%     -    0s
H    0     0                    39954.000000 39944.0411  0.02%     -    0s
     0     0 39944.8425    0   36 39954.0000 39944.8425  0.02%     -    0s
     0     0 39944.8425    0   12 39954.0000 39944.8425  0.02%     -    0s
     0     0 39944.8425    0   36 39954.0000 39944.8425  0.02%     -    0s
     0     2 39945.0772    0   36 39954.0000 39945.0772  0.02%     -    1s
H    3     4                    39953.000000 39945.0772  0.02%   0.7    1s
H    7     6                    39952.000000 39946.8379  0.01%   0.3    1s
H   11     8                    39951.000000 39947.4016  0.01%   0.2    1s

Cutting planes:
  Gomory: 6
  MIR: 20
  Zero half: 7

Explored 11 nodes (12639 simplex iterations) in 1.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.995100000000e+04, best bound 3.994800000000e+04, gap 0.0075%