Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:55:15 2013

Optimize a model with 23478 rows, 2704 columns and 71656 nonzeros
Presolve removed 2892 rows and 1394 columns
Presolve time: 0.17s
Presolved: 20586 rows, 1310 columns, 62539 nonzeros
Variable types: 16 continuous, 1294 integer (1294 binary)
Found heuristic solution: objective 63042.000000

Root relaxation: objective 5.130221e+04, 3494 iterations, 0.20 seconds

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

     0     0 51302.2083    0    8 63042.0000 51302.2083  18.6%     -    0s
H    0     0                    51316.000000 51302.2083  0.03%     -    0s
H    0     0                    51313.000000 51302.2083  0.02%     -    0s
     0     0 51302.9437    0   26 51313.0000 51302.9437  0.02%     -    0s
     0     0 51302.9437    0    9 51313.0000 51302.9437  0.02%     -    0s
     0     0 51302.9447    0   26 51313.0000 51302.9447  0.02%     -    0s
H    0     0                    51309.000000 51302.9447  0.01%     -    0s
     0     1 51302.9888    0   26 51309.0000 51302.9888  0.01%     -    0s

Cutting planes:
  Gomory: 7
  Cover: 2
  MIR: 17
  Zero half: 8

Explored 6 nodes (3963 simplex iterations) in 0.67 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.130900000000e+04, best bound 5.130500000000e+04, gap 0.0078%