Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:10:57 2013

Optimize a model with 8280 rows, 12040 columns and 40020 nonzeros
Presolve removed 60 rows and 40 columns
Presolve time: 0.21s
Presolved: 8220 rows, 12000 columns, 31960 nonzeros
Variable types: 8020 continuous, 3980 integer (3980 binary)

Root relaxation: objective 3.709539e+04, 3015 iterations, 0.11 seconds

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

     0     0 37095.3933    0    4          - 37095.3933     -      -    0s
     0     0 37142.3817    0    1          - 37142.3817     -      -    0s
     0     0 37142.3817    0    1          - 37142.3817     -      -    0s
     0     0 37142.3817    0    1          - 37142.3817     -      -    0s
     0     0 37142.3817    0    1          - 37142.3817     -      -    0s
     0     2 37146.8403    0    1          - 37146.8403     -      -    1s
   213   215 37559.6176  213    1          - 37180.7328     -    5.6    5s
H  503   279                    37664.107998 37180.7328  1.28%   5.0    9s
   508   275 37184.3863    2    1 37664.1080 37183.7910  1.28%   5.5   10s
H  557    72                    37256.142664 37183.7910  0.19%   5.5   10s
H  621   125                    37253.911492 37186.7860  0.18%   5.1   11s
H  624   122                    37253.834765 37186.7860  0.18%   5.1   11s
*  626   122              60    37253.699547 37186.7860  0.18%   5.2   11s
*  690   171              56    37253.494793 37189.9537  0.17%   4.9   11s
  1681   368 37243.7078   21    2 37253.4948 37243.2401  0.03%   6.4   15s

Cutting planes:
  Gomory: 4
  Flow cover: 8

Explored 3001 nodes (18744 simplex iterations) in 16.58 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.725349479311e+04, best bound 3.724977802461e+04, gap 0.0100%