Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:18 2013

Optimize a model with 31976 rows, 31416 columns and 125496 nonzeros
Presolve removed 2224 rows and 0 columns
Presolve time: 0.18s
Presolved: 29752 rows, 31416 columns, 121048 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 5.256702e+04, 4661 iterations, 0.55 seconds

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

     0     0 52567.0173    0    4          - 52567.0173     -      -    0s
H    0     0                    53754.000000 52567.0173  2.21%     -    0s
H    0     0                    52781.000000 52567.0173  0.41%     -    0s
H    0     0                    52670.000000 52567.0173  0.20%     -    0s
     0     0 52567.4947    0    4 52670.0000 52567.4947  0.19%     -    1s
     0     0 52568.1102    0    5 52670.0000 52568.1102  0.19%     -    1s
     0     0 52568.2521    0    5 52670.0000 52568.2521  0.19%     -    1s
     0     0 52569.4421    0    3 52670.0000 52569.4421  0.19%     -    1s
     0     0 52569.4421    0    2 52670.0000 52569.4421  0.19%     -    2s
     0     0 52569.4421    0    3 52670.0000 52569.4421  0.19%     -    2s
     0     2 52569.7922    0    3 52670.0000 52569.7922  0.19%     -    3s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 7 nodes (6945 simplex iterations) in 3.22 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.267000000000e+04, best bound 5.267000000000e+04, gap 0.0%