Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:16:02 2013

Optimize a model with 28673 rows, 28143 columns and 112413 nonzeros
Presolve removed 2014 rows and 0 columns
Presolve time: 0.17s
Presolved: 26659 rows, 28143 columns, 108385 nonzeros
Variable types: 28090 continuous, 53 integer (53 binary)

Root relaxation: objective 5.675311e+04, 5108 iterations, 0.53 seconds

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

     0     0 56753.1077    0    2          - 56753.1077     -      -    0s
H    0     0                    56831.000000 56753.1077  0.14%     -    0s
     0     0 56753.5205    0    3 56831.0000 56753.5205  0.14%     -    0s
     0     0     cutoff    0      56831.0000 56831.0000   0.0%     -    1s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 0 nodes (5213 simplex iterations) in 1.12 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.683100000000e+04, best bound 5.683100000000e+04, gap 0.0%