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 3.894400e+04, 348 iterations, 0.01 seconds

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

     0     0 38944.0027    0    2          - 38944.0027     -      -    0s
     0     0 39011.9733    0    2          - 39011.9733     -      -    0s
     0     0 39011.9733    0    2          - 39011.9733     -      -    0s
H    0     0                    43268.765647 39011.9733  9.84%     -    0s
     0     2 39012.9662    0    2 43268.7656 39012.9662  9.84%     -    0s
*    8     6               8    39246.376355 39196.7362  0.13%  13.8    0s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 17 nodes (615 simplex iterations) in 0.17 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924637635461e+04, best bound 3.924637635461e+04, gap 0.0%