Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:38 2012

Optimize a model with 136 rows, 50 columns and 272 nonzeros
Presolve removed 71 rows and 10 columns
Presolve time: 0.00s
Presolved: 65 rows, 40 columns, 154 nonzeros
Variable types: 0 continuous, 40 integer (40 binary)
Found heuristic solution: objective 18.0000000

Root relaxation: objective 2.016667e+01, 43 iterations, 0.00 seconds

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

     0     0   20.16667    0   22   18.00000   20.16667  12.0%     -    0s
H    0     0                      20.0000000   20.16667  0.83%     -    0s

Explored 0 nodes (53 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%