Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:02 2012

Optimize a model with 154 rows, 74 columns and 308 nonzeros
Presolve removed 34 rows and 7 columns
Presolve time: 0.00s
Presolved: 120 rows, 67 columns, 248 nonzeros
Variable types: 0 continuous, 67 integer (67 binary)
Found heuristic solution: objective 30.0000000

Root relaxation: objective 3.350000e+01, 78 iterations, 0.00 seconds

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

     0     0   33.50000    0   39   30.00000   33.50000  11.7%     -    0s
H    0     0                      31.0000000   33.50000  8.06%     -    0s
     0     0   33.00000    0   34   31.00000   33.00000  6.45%     -    0s
     0     0   32.50000    0   51   31.00000   32.50000  4.84%     -    0s
     0     0   32.40000    0   62   31.00000   32.40000  4.52%     -    0s
     0     0   32.30769    0   59   31.00000   32.30769  4.22%     -    0s
     0     0   32.18182    0   51   31.00000   32.18182  3.81%     -    0s
     0     0   32.00000    0   48   31.00000   32.00000  3.23%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 31

Explored 0 nodes (235 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%