Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:41:58 2013

Optimize a model with 520 rows, 5180 columns and 16440 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.02s
Presolved: 500 rows, 5160 columns, 15420 nonzeros
Variable types: 5040 continuous, 120 integer (120 binary)

Root relaxation: objective 4.370285e+04, 541 iterations, 0.02 seconds

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

     0     0 43702.8549    0    6          - 43702.8549     -      -    0s
     0     0 43708.8344    0    6          - 43708.8344     -      -    0s
     0     0 43709.0023    0    6          - 43709.0023     -      -    0s
     0     0 43709.0023    0    6          - 43709.0023     -      -    0s
     0     0 43709.0023    0    6          - 43709.0023     -      -    0s
     0     0 43709.0317    0    6          - 43709.0317     -      -    0s
     0     0 43709.0317    0    6          - 43709.0317     -      -    0s
H    0     0                    48234.695443 43709.0317  9.38%     -    0s
     0     2 43709.5984    0    6 48234.6954 43709.5984  9.38%     -    0s
*   19    12              18    44047.118669 43831.8334  0.49%  13.5    0s
*   37    15              11    44040.331286 43862.9176  0.40%  12.1    0s
*   47     8               9    43900.849511 43889.3820  0.03%  11.0    0s

Cutting planes:
  Flow cover: 7

Explored 56 nodes (1446 simplex iterations) in 0.40 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.390084951135e+04, best bound 4.389694531587e+04, gap 0.0089%