Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:16:34 2013

Optimize a model with 280 rows, 4100 columns and 8200 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.00s
Presolved: 320 rows, 4120 columns, 8260 nonzeros
Variable types: 4080 continuous, 40 integer (40 binary)

Root relaxation: objective 4.370285e+04, 508 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    4          - 43702.8549     -      -    0s
H    0     0                    44032.871381 43702.8549  0.75%     -    0s
     0     0 43723.5780    0    2 44032.8714 43723.5780  0.70%     -    0s
     0     0 43725.7873    0    2 44032.8714 43725.7873  0.70%     -    0s
     0     0 43725.7873    0    2 44032.8714 43725.7873  0.70%     -    0s
     0     0 43726.5548    0    2 44032.8714 43726.5548  0.70%     -    0s
     0     0 43726.5548    0    2 44032.8714 43726.5548  0.70%     -    0s
     0     0 43726.5548    0    2 44032.8714 43726.5548  0.70%     -    0s
     0     2 43730.6678    0    2 44032.8714 43730.6678  0.69%     -    0s
*    4     3               2    43897.308886 43846.8143  0.12%  48.8    0s
*    5     2               3    43846.814321 43846.8143   0.0%  43.0    0s

Cutting planes:
  Flow cover: 4

Explored 6 nodes (856 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.384681432084e+04, best bound 4.384681432084e+04, gap 0.0%