Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:49 2012

Optimize a model with 335 rows, 81 columns and 670 nonzeros
Presolve removed 116 rows and 0 columns
Presolve time: 0.00s
Presolved: 219 rows, 81 columns, 519 nonzeros
Variable types: 0 continuous, 81 integer (81 binary)
Found heuristic solution: objective 23.0000000

Root relaxation: objective 3.061719e+01, 136 iterations, 0.00 seconds

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

     0     0   30.61719    0   78   23.00000   30.61719  33.1%     -    0s
H    0     0                      25.0000000   30.61719  22.5%     -    0s
     0     0   29.66981    0   75   25.00000   29.66981  18.7%     -    0s
     0     0   29.44531    0   78   25.00000   29.44531  17.8%     -    0s
     0     0   29.09032    0   80   25.00000   29.09032  16.4%     -    0s
     0     0   29.00000    0   80   25.00000   29.00000  16.0%     -    0s
     0     0   28.95652    0   80   25.00000   28.95652  15.8%     -    0s
     0     0   28.92593    0   80   25.00000   28.92593  15.7%     -    0s
H    0     0                      27.0000000   28.92593  7.13%     -    0s
     0     0   28.91536    0   81   27.00000   28.91536  7.09%     -    0s
     0     0   28.91536    0   81   27.00000   28.91536  7.09%     -    0s
     0     2   28.91489    0   81   27.00000   28.91489  7.09%     -    0s

Cutting planes:
  Zero half: 28

Explored 12 nodes (760 simplex iterations) in 0.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%