Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:15:59 2013

Optimize a model with 480 rows, 4640 columns and 9620 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.02s
Presolved: 440 rows, 4580 columns, 9160 nonzeros
Variable types: 4400 continuous, 180 integer (180 binary)

Root relaxation: objective 4.370285e+04, 517 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 43723.5780    0    1          - 43723.5780     -      -    0s
     0     0 43723.6619    0    1          - 43723.6619     -      -    0s
     0     0 43724.0117    0    2          - 43724.0117     -      -    0s
     0     0 43724.0117    0    2          - 43724.0117     -      -    0s
     0     0 43724.8982    0    2          - 43724.8982     -      -    0s
     0     0 43726.5548    0    1          - 43726.5548     -      -    0s
     0     0 43726.5548    0    1          - 43726.5548     -      -    0s
     0     0 43726.5548    0    1          - 43726.5548     -      -    0s
     0     0 43726.5548    0    1          - 43726.5548     -      -    0s
H    0     0                    44529.286095 43726.5548  1.80%     -    0s
     0     2 43727.8992    0    1 44529.2861 43727.8992  1.80%     -    0s
*   22    16              21    44041.268606 43804.6398  0.54%  12.0    0s
*   43    24              19    44038.692081 43878.3309  0.36%  11.1    0s
*   48     2               5    43900.453435 43887.6398  0.03%  11.0    0s

Cutting planes:
  Flow cover: 12

Explored 51 nodes (1181 simplex iterations) in 0.26 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.390045343473e+04, best bound 4.390045343473e+04, gap 0.0%