Gurobi 5.0.1 (linux64) logging started Sat Dec  8 02:35:58 2012

Optimize a model with 285 rows, 270 columns and 889 nonzeros
Presolve removed 36 rows and 22 columns
Presolve time: 0.00s
Presolved: 249 rows, 248 columns, 799 nonzeros
Variable types: 167 continuous, 81 integer (81 binary)

Root relaxation: objective 2.746112e+04, 130 iterations, 0.00 seconds

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

     0     0 27461.1216    0   40          - 27461.1216     -      -    0s
H    0     0                    49541.000000 27461.1216  44.6%     -    0s
     0     0 31175.1199    0   22 49541.0000 31175.1199  37.1%     -    0s
     0     0 31486.4989    0   18 49541.0000 31486.4989  36.4%     -    0s
     0     0 31568.2464    0   18 49541.0000 31568.2464  36.3%     -    0s
     0     0 31576.0904    0   17 49541.0000 31576.0904  36.3%     -    0s
     0     0 31578.0086    0   19 49541.0000 31578.0086  36.3%     -    0s
     0     2 31580.7041    0   19 49541.0000 31580.7041  36.3%     -    0s
H   27    26                    32268.000000 31588.3281  2.11%   6.8    0s
H   95    56                    32209.000000 31644.6802  1.75%   5.5    0s
*  168    81              21    32069.000000 31664.6704  1.26%   5.5    0s
   779   177 32053.7671   25    3 32069.0000 31854.5691  0.67%   6.2    5s
* 1176    75              31    32067.000000 31966.1918  0.31%   5.6    7s

Cutting planes:
  Gomory: 4
  Flow cover: 11
  Flow path: 4

Explored 1364 nodes (7458 simplex iterations) in 8.61 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.206700000000e+04, best bound 3.206435256162e+04, gap 0.0083%