Gurobi 5.0.1 (linux64) logging started Wed Apr 24 00:54:02 2013

Optimize a model with 9951 rows, 9641 columns and 38471 nonzeros
Presolve removed 597 rows and 0 columns
Presolve time: 0.05s
Presolved: 9354 rows, 9641 columns, 37277 nonzeros
Variable types: 9610 continuous, 31 integer (31 binary)

Root relaxation: objective 2.840378e+04, 1287 iterations, 0.07 seconds

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

     0     0 28403.7842    0    5          - 28403.7842     -      -    0s
H    0     0                    29063.000000 28403.7842  2.27%     -    0s
H    0     0                    28532.000000 28403.7842  0.45%     -    0s
     0     0 28416.3381    0    6 28532.0000 28416.3381  0.41%     -    0s
     0     0 28416.3381    0    6 28532.0000 28416.3381  0.41%     -    0s
     0     0 28437.1120    0    6 28532.0000 28437.1120  0.33%     -    0s
     0     0 28437.1132    0    5 28532.0000 28437.1132  0.33%     -    0s
     0     0 28437.1132    0    4 28532.0000 28437.1132  0.33%     -    0s
     0     0 28442.1552    0    5 28532.0000 28442.1552  0.31%     -    0s
     0     0 28442.1552    0    5 28532.0000 28442.1552  0.31%     -    0s
     0     0 28445.3919    0    5 28532.0000 28445.3919  0.30%     -    0s
     0     2 28451.4185    0    5 28532.0000 28451.4185  0.28%     -    0s
*    4     2               4    28524.000000 28496.6584  0.10%  20.2    0s
*    8     1               3    28515.000000 28514.5634  0.00%  16.8    0s

Cutting planes:
  Gomory: 4
  Flow cover: 3

Explored 9 nodes (2081 simplex iterations) in 0.82 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.851500000000e+04, best bound 2.851456338028e+04, gap 0.0015%