Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:46 2013

Optimize a model with 4320 rows, 12060 columns and 36100 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.30s
Presolved: 4300 rows, 12040 columns, 32080 nonzeros
Variable types: 8040 continuous, 4000 integer (4000 binary)

Root relaxation: objective 3.894400e+04, 507 iterations, 0.03 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 39051.4032    0    4          - 39051.4032     -      -    0s
     0     0 39067.1972    0    4          - 39067.1972     -      -    0s
     0     0 39067.8687    0    4          - 39067.8687     -      -    0s
     0     0 39067.8687    0    4          - 39067.8687     -      -    0s
     0     0 39067.8687    0    4          - 39067.8687     -      -    0s
     0     2 39067.8687    0    4          - 39067.8687     -      -    1s
*   22     6              11    39247.135892 39247.1359   0.0%  28.2    1s

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

Explored 23 nodes (1444 simplex iterations) in 1.58 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924713589172e+04, best bound 3.924713589172e+04, gap 0.0%