Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:04:35 2013

Optimize a model with 21666 rows, 21206 columns and 84686 nonzeros
Presolve removed 1474 rows and 0 columns
Presolve time: 0.13s
Presolved: 20192 rows, 21206 columns, 81738 nonzeros
Variable types: 21160 continuous, 46 integer (46 binary)

Root relaxation: objective 5.516258e+04, 4419 iterations, 0.37 seconds

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

     0     0 55162.5773    0    3          - 55162.5773     -      -    0s
H    0     0                    55675.000000 55162.5773  0.92%     -    0s
H    0     0                    55231.000000 55162.5773  0.12%     -    0s
     0     0 55165.7307    0    4 55231.0000 55165.7307  0.12%     -    0s
     0     0 55165.7975    0    4 55231.0000 55165.7975  0.12%     -    0s
     0     0 55212.7200    0    3 55231.0000 55212.7200  0.03%     -    1s
     0     0 55217.0079    0    2 55231.0000 55217.0079  0.03%     -    1s
     0     0 55217.0079    0    2 55231.0000 55217.0079  0.03%     -    1s
     0     0 55217.6429    0    1 55231.0000 55217.6429  0.02%     -    1s
     0     0 55217.7062    0    2 55231.0000 55217.7062  0.02%     -    1s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 0 nodes (5894 simplex iterations) in 1.45 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.523100000000e+04, best bound 5.523100000000e+04, gap 0.0%