Gurobi 5.0.1 (linux64) logging started Sat Dec  8 02:35:17 2012

Optimize a model with 285 rows, 270 columns and 891 nonzeros
Presolve removed 18 rows and 11 columns
Presolve time: 0.00s
Presolved: 267 rows, 259 columns, 857 nonzeros
Variable types: 173 continuous, 86 integer (86 binary)

Root relaxation: objective 2.714033e+04, 148 iterations, 0.00 seconds

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

     0     0 27140.3326    0   37          - 27140.3326     -      -    0s
H    0     0                    40608.000000 27140.3326  33.2%     -    0s
     0     0 30921.8405    0   22 40608.0000 30921.8405  23.9%     -    0s
     0     0 31157.8149    0   19 40608.0000 31157.8149  23.3%     -    0s
     0     0 31243.6044    0   19 40608.0000 31243.6044  23.1%     -    0s
     0     0 31270.7556    0   18 40608.0000 31270.7556  23.0%     -    0s
     0     0 31273.6984    0   19 40608.0000 31273.6984  23.0%     -    0s
     0     2 31279.8783    0   19 40608.0000 31279.8783  23.0%     -    0s
H   27    27                    40057.000000 31311.7828  21.8%   5.7    0s
H   30    30                    33125.608483 31311.7828  5.48%   5.3    0s
H   32    32                    33024.608483 31311.7828  5.19%   5.0    0s
H   37    37                    32633.874631 31311.7828  4.05%   4.6    0s
*   39    25              36    32135.000000 31311.7828  2.56%   4.5    0s
H  199    93                    32033.000000 31468.7703  1.76%   5.9    0s
H  600   203                    31914.000000 31575.3452  1.06%   5.6    0s

Cutting planes:
  Gomory: 22
  Cover: 4
  Implied bound: 1
  Flow cover: 74
  Flow path: 28

Explored 1388 nodes (9776 simplex iterations) in 0.53 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.191400000000e+04, best bound 3.191170254593e+04, gap 0.0072%