Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:13:44 2013

Optimize a model with 27612 rows, 27092 columns and 108212 nonzeros
Presolve removed 3470 rows and 0 columns
Presolve time: 0.16s
Presolved: 24142 rows, 27092 columns, 101272 nonzeros
Variable types: 27040 continuous, 52 integer (52 binary)

Root relaxation: objective 5.586777e+04, 4825 iterations, 0.54 seconds

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

     0     0 55867.7711    0    4          - 55867.7711     -      -    0s
H    0     0                    58084.000000 55867.7711  3.82%     -    0s
     0     0 55868.8188    0    5 58084.0000 55868.8188  3.81%     -    1s
H    0     0                    57770.025291 55868.8188  3.29%     -    1s
H    0     0                    57184.480000 55868.8188  2.30%     -    1s
     0     2 55868.9988    0    5 57184.4800 55868.9988  2.30%     -    2s
H    2     2                    56016.186667 55883.5007  0.24%  20.0    2s
H    5     3                    56008.931092 55919.1765  0.16%  49.6    2s
H    7     4                    55995.846154 55923.8462  0.13%  43.7    2s
*    8     4               7    55938.000000 55933.3077  0.01%  45.9    2s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 9 nodes (5271 simplex iterations) in 2.41 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.593800000000e+04, best bound 5.593330769231e+04, gap 0.0084%