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

Optimize a model with 320 rows, 4160 columns and 8340 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.01s
Presolved: 280 rows, 4100 columns, 8200 nonzeros
Variable types: 4080 continuous, 20 integer (20 binary)

Root relaxation: objective 4.370285e+04, 442 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
H    0     0                    44257.529669 43702.8549  1.25%     -    0s
     0     0 43723.5780    0    1 44257.5297 43723.5780  1.21%     -    0s
     0     0 43725.7873    0    1 44257.5297 43725.7873  1.20%     -    0s
     0     0 43725.7873    0    1 44257.5297 43725.7873  1.20%     -    0s
     0     0 43725.7873    0    1 44257.5297 43725.7873  1.20%     -    0s
     0     0 43726.2989    0    1 44257.5297 43726.2989  1.20%     -    0s
     0     0 43726.2989    0    1 44257.5297 43726.2989  1.20%     -    0s
     0     2 43741.6678    0    1 44257.5297 43741.6678  1.17%     -    0s
*    3     3               3    43846.814321 43836.8347  0.02%  19.0    0s

Cutting planes:
  Flow cover: 4

Explored 7 nodes (618 simplex iterations) in 0.09 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%