Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:01 2012

Optimize a model with 124 rows, 68 columns and 248 nonzeros
Presolve removed 25 rows and 9 columns
Presolve time: 0.00s
Presolved: 99 rows, 59 columns, 203 nonzeros
Variable types: 0 continuous, 59 integer (59 binary)
Found heuristic solution: objective 30.0000000

Root relaxation: objective 3.275000e+01, 68 iterations, 0.00 seconds

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

     0     0   32.75000    0   54   30.00000   32.75000  9.17%     -    0s
     0     0   31.75000    0   52   30.00000   31.75000  5.83%     -    0s
H    0     0                      31.0000000   31.75000  2.42%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 4

Explored 0 nodes (117 simplex iterations) in 0.01 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%