Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:28 2013

Optimize a model with 4320 rows, 12060 columns and 36100 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.24s
Presolved: 4300 rows, 12040 columns, 32080 nonzeros
Variable types: 8040 continuous, 4000 integer (4000 binary)

Root relaxation: objective 3.573401e+04, 504 iterations, 0.01 seconds

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

     0     0 35734.0139    0    6          - 35734.0139     -      -    0s
     0     0 35842.5193    0    9          - 35842.5193     -      -    0s
     0     0 35852.5761    0    6          - 35852.5761     -      -    0s
     0     0 35854.7280    0    8          - 35854.7280     -      -    0s
     0     0 35857.5023    0    7          - 35857.5023     -      -    0s
     0     0 35860.4196    0    9          - 35860.4196     -      -    0s
     0     0 35861.7667    0    8          - 35861.7667     -      -    0s
     0     0 35862.4273    0    9          - 35862.4273     -      -    0s
     0     0 35862.6236    0    8          - 35862.6236     -      -    0s
     0     0 35863.3536    0   10          - 35863.3536     -      -    0s
     0     0 35863.3536    0   10          - 35863.3536     -      -    1s
     0     2 35863.3536    0   10          - 35863.3536     -      -    1s
*   30    10              15    36177.907229 36093.9560  0.23%  33.4    2s
*   40     3              13    36173.472242 36173.4603  0.00%  26.2    2s

Cutting planes:
  Gomory: 5
  Implied bound: 113
  Flow cover: 5

Explored 41 nodes (2215 simplex iterations) in 2.16 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.617347224193e+04, best bound 3.617346029370e+04, gap 0.0000%