Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:20:01 2013

Optimize a model with 30855 rows, 30305 columns and 121055 nonzeros
Presolve removed 966 rows and 0 columns
Presolve time: 0.17s
Presolved: 29889 rows, 30305 columns, 119123 nonzeros
Variable types: 30250 continuous, 55 integer (55 binary)

Root relaxation: objective 5.657681e+04, 4392 iterations, 0.61 seconds

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

     0     0 56576.8089    0    7          - 56576.8089     -      -    0s
H    0     0                    57241.000000 56576.8089  1.16%     -    0s
     0     0 56579.5936    0    8 57241.0000 56579.5936  1.16%     -    1s
     0     0 56580.5088    0    8 57241.0000 56580.5088  1.15%     -    1s
     0     2 56582.9945    0    8 57241.0000 56582.9945  1.15%     -    2s
H    7     6                    57011.461538 56677.7120  0.59%  94.1    3s
H    9     7                    56837.727273 56677.7120  0.28%  98.0    3s
H   14    11                    56828.666667 56677.7120  0.27%  80.1    3s
*   15    10              12    56770.000000 56677.7120  0.16%  79.0    3s
*   17     8              10    56765.000000 56677.7120  0.15%  70.8    3s

Cutting planes:
  Gomory: 3
  Flow cover: 9

Explored 34 nodes (6563 simplex iterations) in 3.62 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.676500000000e+04, best bound 5.675945454545e+04, gap 0.0098%