Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:50:30 2013

Optimize a model with 2320 rows, 8060 columns and 22100 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.15s
Presolved: 2300 rows, 8040 columns, 20080 nonzeros
Variable types: 6040 continuous, 2000 integer (2000 binary)

Root relaxation: objective 3.894400e+04, 503 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    4          - 38944.0027     -      -    0s
     0     0 39045.8085    0    6          - 39045.8085     -      -    0s
     0     0 39061.4213    0    4          - 39061.4213     -      -    0s
     0     0 39061.9241    0    4          - 39061.9241     -      -    0s
     0     0 39061.9241    0    4          - 39061.9241     -      -    0s
     0     0 39061.9241    0    4          - 39061.9241     -      -    0s
     0     2 39061.9241    0    4          - 39061.9241     -      -    0s
*   20     6              10    39247.130682 39247.1307   0.0%  29.3    0s

Cutting planes:
  Gomory: 1
  Implied bound: 12
  Flow cover: 2

Explored 21 nodes (1389 simplex iterations) in 0.85 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924713068171e+04, best bound 3.924713068171e+04, gap 0.0%