Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:00 2012

Optimize a model with 135 rows, 65 columns and 270 nonzeros
Presolve removed 56 rows and 19 columns
Presolve time: 0.00s
Presolved: 79 rows, 46 columns, 161 nonzeros
Variable types: 0 continuous, 46 integer (46 binary)
Found heuristic solution: objective 27.0000000

Root relaxation: objective 3.100000e+01, 55 iterations, 0.00 seconds

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

     0     0   31.00000    0   36   27.00000   31.00000  14.8%     -    0s
H    0     0                      28.0000000   31.00000  10.7%     -    0s
H    0     0                      30.0000000   31.00000  3.33%     -    0s

Cutting planes:
  Zero half: 1

Explored 0 nodes (98 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.000000000000e+01, best bound 3.100000000000e+01, gap 3.3333%