Gurobi 5.0.1 (linux64) logging started Sat Nov 17 19:52:28 2012

Optimize a model with 87 rows, 57 columns and 272 nonzeros
Presolve time: 0.00s
Presolved: 87 rows, 57 columns, 272 nonzeros
Variable types: 0 continuous, 57 integer (57 binary)
Found heuristic solution: objective 23.0000000

Root relaxation: objective 0.000000e+00, 21 iterations, 0.00 seconds

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

     0     0    0.00000    0   14   23.00000    0.00000   100%     -    0s
H    0     0                      18.0000000    0.00000   100%     -    0s
     0     0    0.58333    0   15   18.00000    0.58333  96.8%     -    0s
     0     0    1.02083    0   16   18.00000    1.02083  94.3%     -    0s
     0     0    1.59959    0   18   18.00000    1.59959  91.1%     -    0s
     0     0    1.60417    0   19   18.00000    1.60417  91.1%     -    0s
H    0     0                      16.0000000    1.60417  90.0%     -    0s
     0     2    1.61389    0   19   16.00000    1.61389  89.9%     -    0s
*   44     8               8      15.0000000    7.40000  50.7%  12.2    0s

Cutting planes:
  Gomory: 5
  Zero half: 2

Explored 75 nodes (879 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.500000000000e+01, best bound 1.500000000000e+01, gap 0.0%