Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:58 2012

Optimize a model with 408 rows, 89 columns and 816 nonzeros
Presolve removed 147 rows and 0 columns
Presolve time: 0.00s
Presolved: 261 rows, 89 columns, 640 nonzeros
Variable types: 0 continuous, 89 integer (89 binary)
Found heuristic solution: objective 24.0000000

Root relaxation: objective 3.209677e+01, 161 iterations, 0.00 seconds

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

     0     0   32.09677    0   80   24.00000   32.09677  33.7%     -    0s
H    0     0                      28.0000000   32.09677  14.6%     -    0s
     0     0   31.58642    0   80   28.00000   31.58642  12.8%     -    0s
     0     0   31.47943    0   76   28.00000   31.47943  12.4%     -    0s
     0     0   31.40513    0   83   28.00000   31.40513  12.2%     -    0s
     0     0   31.15638    0   81   28.00000   31.15638  11.3%     -    0s
     0     0   31.11485    0   81   28.00000   31.11485  11.1%     -    0s
     0     0   31.10643    0   81   28.00000   31.10643  11.1%     -    0s
     0     0   31.10643    0   79   28.00000   31.10643  11.1%     -    0s
     0     2   31.10287    0   79   28.00000   31.10287  11.1%     -    0s

Cutting planes:
  Gomory: 1
  Clique: 4
  Zero half: 36

Explored 78 nodes (2105 simplex iterations) in 0.09 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%