Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:46:44 2013

Optimize a model with 20320 rows, 44060 columns and 148100 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.40s
Presolved: 20300 rows, 44040 columns, 128080 nonzeros
Variable types: 24040 continuous, 20000 integer (20000 binary)

Root relaxation: objective 3.894400e+04, 588 iterations, 0.07 seconds

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

     0     0 38944.0027    0    4          - 38944.0027     -      -    1s
     0     0 39013.8759    0    4          - 39013.8759     -      -    2s
     0     0 39030.6493    0    5          - 39030.6493     -      -    2s
     0     0 39030.6493    0    5          - 39030.6493     -      -    2s
H    0     0                    40104.986540 39030.6493  2.68%     -    3s
     0     2 39030.6493    0    5 40104.9865 39030.6493  2.68%     -    3s
*   28     6              14    39247.138434 39247.1384   0.0%  20.7    4s

Cutting planes:
  Gomory: 3
  Implied bound: 8
  Flow cover: 1

Explored 29 nodes (1518 simplex iterations) in 4.77 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924713843363e+04, best bound 3.924713843363e+04, gap 0.0%