Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:36 2013

Optimize a model with 31976 rows, 31416 columns and 125496 nonzeros
Presolve removed 1252 rows and 0 columns
Presolve time: 0.18s
Presolved: 30724 rows, 31416 columns, 122992 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 6.117856e+04, 5955 iterations, 0.68 seconds

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

     0     0 61178.5559    0    3          - 61178.5559     -      -    0s
H    0     0                    61832.000000 61178.5559  1.06%     -    1s
H    0     0                    61309.000000 61178.5559  0.21%     -    1s
     0     0 61189.1932    0    5 61309.0000 61189.1932  0.20%     -    1s
     0     0 61189.1932    0    5 61309.0000 61189.1932  0.20%     -    1s
     0     0 61189.1932    0    5 61309.0000 61189.1932  0.20%     -    1s
     0     0 61272.7412    0    2 61309.0000 61272.7412  0.06%     -    2s
     0     0 61272.7412    0    2 61309.0000 61272.7412  0.06%     -    2s
     0     0 61273.5591    0    1 61309.0000 61273.5591  0.06%     -    3s
     0     0 61275.4299    0    3 61309.0000 61275.4299  0.05%     -    3s
     0     0 61283.3530    0    1 61309.0000 61283.3530  0.04%     -    3s
     0     2 61286.4301    0    1 61309.0000 61286.4301  0.04%     -    3s

Cutting planes:
  Gomory: 1

Explored 3 nodes (8073 simplex iterations) in 3.50 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.130900000000e+04, best bound 6.130900000000e+04, gap 0.0%