Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012

Optimize a model with 311 rows, 81 columns and 622 nonzeros
Presolve removed 99 rows and 2 columns
Presolve time: 0.00s
Presolved: 212 rows, 79 columns, 498 nonzeros
Variable types: 0 continuous, 79 integer (79 binary)
Found heuristic solution: objective 25.0000000

Root relaxation: objective 3.200000e+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   32.00000    0   54   25.00000   32.00000  28.0%     -    0s
H    0     0                      26.0000000   32.00000  23.1%     -    0s
     0     0   31.00000    0   71   26.00000   31.00000  19.2%     -    0s
     0     0   31.00000    0   75   26.00000   31.00000  19.2%     -    0s
     0     0   30.94667    0   75   26.00000   30.94667  19.0%     -    0s
     0     0   30.82031    0   76   26.00000   30.82031  18.5%     -    0s
H    0     0                      27.0000000   30.82031  14.1%     -    0s
     0     0   30.64323    0   78   27.00000   30.64323  13.5%     -    0s
     0     0   30.56502    0   78   27.00000   30.56502  13.2%     -    0s
     0     0   30.55275    0   79   27.00000   30.55275  13.2%     -    0s
     0     0   30.55275    0   78   27.00000   30.55275  13.2%     -    0s
     0     2   30.55147    0   78   27.00000   30.55147  13.2%     -    0s
*   18     6               4      28.0000000   30.27273  8.12%  21.6    0s

Cutting planes:
  Gomory: 1
  Clique: 3
  Zero half: 26

Explored 37 nodes (1143 simplex iterations) in 0.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%