Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:57:07 2013

Optimize a model with 30913 rows, 3249 columns and 94221 nonzeros
Presolve removed 3487 rows and 1661 columns
Presolve time: 0.22s
Presolved: 27426 rows, 1588 columns, 83732 nonzeros
Variable types: 27 continuous, 1561 integer (1561 binary)
Found heuristic solution: objective 68378.000000

Root relaxation: objective 5.178131e+04, 12362 iterations, 0.86 seconds

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

     0     0 51781.3056    0    8 68378.0000 51781.3056  24.3%     -    1s
H    0     0                    51795.000000 51781.3056  0.03%     -    1s
H    0     0                    51791.000000 51781.3056  0.02%     -    1s
H    0     0                    51789.000000 51781.3056  0.01%     -    1s
     0     0 51782.1070    0   29 51789.0000 51782.1070  0.01%     -    1s
     0     0 51782.1070    0   10 51789.0000 51782.1070  0.01%     -    1s
     0     0 51783.5878    0   21 51789.0000 51783.5878  0.01%     -    1s
     0     0 51783.8564    0   28 51789.0000 51783.8564  0.01%     -    1s

Cutting planes:
  Gomory: 2
  MIR: 17

Explored 0 nodes (12622 simplex iterations) in 1.41 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.178900000000e+04, best bound 5.178400000000e+04, gap 0.0097%