Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:19:47 2013

Optimize a model with 30855 rows, 30305 columns and 121055 nonzeros
Presolve removed 3599 rows and 0 columns
Presolve time: 0.17s
Presolved: 27256 rows, 30305 columns, 113857 nonzeros
Variable types: 30250 continuous, 55 integer (55 binary)

Root relaxation: objective 5.428289e+04, 4377 iterations, 0.53 seconds

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

     0     0 54282.8907    0    5          - 54282.8907     -      -    0s
H    0     0                    55920.000000 54282.8907  2.93%     -    0s
H    0     0                    54456.000000 54282.8907  0.32%     -    1s
     0     0 54288.3499    0    7 54456.0000 54288.3499  0.31%     -    1s
     0     0 54288.4140    0    7 54456.0000 54288.4140  0.31%     -    1s
     0     0 54288.4140    0    5 54456.0000 54288.4140  0.31%     -    2s
     0     0 54289.4435    0    8 54456.0000 54289.4435  0.31%     -    2s
     0     0 54294.1904    0    5 54456.0000 54294.1904  0.30%     -    3s
     0     2 54297.5838    0    5 54456.0000 54297.5838  0.29%     -    3s

Cutting planes:
  Gomory: 1
  Flow cover: 6

Explored 8 nodes (7239 simplex iterations) in 3.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.445600000000e+04, best bound 5.445600000000e+04, gap 0.0%