Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:16:12 2013

Optimize a model with 520 rows, 4460 columns and 9500 nonzeros
Presolve removed 40 rows and 40 columns
Presolve time: 0.02s
Presolved: 480 rows, 4420 columns, 9360 nonzeros
Variable types: 4240 continuous, 180 integer (180 binary)

Root relaxation: objective 3.709539e+04, 383 iterations, 0.01 seconds

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

     0     0 37095.3933    0    4          - 37095.3933     -      -    0s
     0     0 37112.7641    0    2          - 37112.7641     -      -    0s
     0     0 37112.7641    0    2          - 37112.7641     -      -    0s
H    0     0                    37258.678632 37112.7641  0.39%     -    0s
     0     2 37122.3817    0    2 37258.6786 37122.3817  0.37%     -    0s
*    5     4               4    37255.478772 37141.9697  0.30%  14.4    0s
*    8     3               4    37252.636188 37141.9697  0.30%  13.6    0s

Cutting planes:
  Gomory: 2
  Flow cover: 5

Explored 14 nodes (669 simplex iterations) in 0.11 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.725263618801e+04, best bound 3.725263618801e+04, gap 0.0%