Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:05:48 2013

Optimize a model with 22607 rows, 22137 columns and 88407 nonzeros
Presolve removed 2029 rows and 0 columns
Presolve time: 0.13s
Presolved: 20578 rows, 22137 columns, 84349 nonzeros
Variable types: 22090 continuous, 47 integer (47 binary)

Root relaxation: objective 5.425981e+04, 4162 iterations, 0.38 seconds

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

     0     0 54259.8078    0    4          - 54259.8078     -      -    0s
H    0     0                    56849.000000 54259.8078  4.55%     -    0s
H    0     0                    56458.000000 54259.8078  3.89%     -    0s
     0     0 54261.6276    0    6 56458.0000 54261.6276  3.89%     -    0s
H    0     0                    56447.000000 54261.6276  3.87%     -    0s
     0     0 54261.9443    0    6 56447.0000 54261.9443  3.87%     -    0s
H    0     0                    54423.000000 54261.9443  0.30%     -    0s
     0     0 54262.0041    0    6 54423.0000 54262.0041  0.30%     -    1s
     0     0 54262.0073    0    6 54423.0000 54262.0073  0.30%     -    1s
     0     0 54262.8975    0    4 54423.0000 54262.8975  0.29%     -    1s
     0     2 54272.8525    0    4 54423.0000 54272.8525  0.28%     -    1s

Cutting planes:
  Gomory: 1
  Flow cover: 4

Explored 5 nodes (4424 simplex iterations) in 1.72 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.442300000000e+04, best bound 5.442300000000e+04, gap 0.0%