Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:16:10 2013

Optimize a model with 520 rows, 4460 columns and 9500 nonzeros
Presolve removed 40 rows and 40 columns
Presolve time: 0.02s
Presolved: 480 rows, 4420 columns, 9360 nonzeros
Variable types: 4240 continuous, 180 integer (180 binary)

Root relaxation: objective 4.370285e+04, 496 iterations, 0.01 seconds

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

     0     0 43702.8549    0    2          - 43702.8549     -      -    0s
     0     0 43729.3428    0    1          - 43729.3428     -      -    0s
     0     0 43729.3428    0    1          - 43729.3428     -      -    0s
H    0     0                    44529.286095 43729.3428  1.80%     -    0s
     0     2 43735.2388    0    1 44529.2861 43735.2388  1.78%     -    0s
*   22    18              22    44059.523259 43835.2232  0.51%  14.4    0s
*   23    13              21    44041.268606 43835.2232  0.47%  14.1    0s
*   45    23              20    44038.692081 43850.8445  0.43%  11.8    0s
H   54     2                    43900.453435 43878.3309  0.05%  11.4    0s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 56 nodes (1205 simplex iterations) in 0.21 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.390045343473e+04, best bound 4.389694531587e+04, gap 0.0080%