Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:19 2013

Optimize a model with 4320 rows, 12060 columns and 36100 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.19s
Presolved: 4300 rows, 12040 columns, 32080 nonzeros
Variable types: 8040 continuous, 4000 integer (4000 binary)

Root relaxation: objective 3.839329e+04, 546 iterations, 0.02 seconds

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

     0     0 38393.2919    0    4          - 38393.2919     -      -    0s
     0     0 38503.9407    0    5          - 38503.9407     -      -    0s
     0     0 38514.1626    0    4          - 38514.1626     -      -    0s
     0     0 38517.4422    0    4          - 38517.4422     -      -    0s
     0     0 38518.0991    0    4          - 38518.0991     -      -    0s
     0     0 38518.0991    0    4          - 38518.0991     -      -    0s
     0     2 38518.0991    0    4          - 38518.0991     -      -    1s
*   30     6              15    38634.720802 38634.7208   0.0%  32.8    1s

Cutting planes:
  Gomory: 4
  Implied bound: 13

Explored 31 nodes (1836 simplex iterations) in 1.60 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.863472080165e+04, best bound 3.863472080165e+04, gap 0.0%