Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:15:58 2013

Optimize a model with 28673 rows, 28143 columns and 112413 nonzeros
Presolve removed 1277 rows and 0 columns
Presolve time: 0.16s
Presolved: 27396 rows, 28143 columns, 109859 nonzeros
Variable types: 28090 continuous, 53 integer (53 binary)

Root relaxation: objective 5.455720e+04, 4718 iterations, 0.52 seconds

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

     0     0 54557.1967    0    5          - 54557.1967     -      -    0s
H    0     0                    55916.000000 54557.1967  2.43%     -    0s
     0     0 54561.0885    0    6 55916.0000 54561.0885  2.42%     -    1s
     0     0 54562.2523    0    6 55916.0000 54562.2523  2.42%     -    1s
     0     0 54562.5110    0    6 55916.0000 54562.5110  2.42%     -    1s
     0     0 54562.5110    0    6 55916.0000 54562.5110  2.42%     -    1s
     0     2 54563.1795    0    6 55916.0000 54563.1795  2.42%     -    2s
H    3     3                    55048.453968 54618.2388  0.78%  85.0    2s
H    4     3                    54833.489918 54618.2388  0.39%  84.5    2s
H    6     5                    54737.000000 54618.2388  0.22%  70.5    2s
*    7     4               7    54724.000000 54618.2388  0.19%  67.4    2s

Cutting planes:
  Gomory: 1
  Flow cover: 9

Explored 12 nodes (5513 simplex iterations) in 2.36 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.472400000000e+04, best bound 5.472400000000e+04, gap 0.0%