Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:39 2012

Optimize a model with 160 rows, 53 columns and 320 nonzeros
Presolve removed 55 rows and 2 columns
Presolve time: 0.00s
Presolved: 105 rows, 51 columns, 242 nonzeros
Variable types: 0 continuous, 51 integer (51 binary)
Found heuristic solution: objective 17.0000000

Root relaxation: objective 2.150000e+01, 61 iterations, 0.00 seconds

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

     0     0   21.50000    0   33   17.00000   21.50000  26.5%     -    0s
H    0     0                      18.0000000   21.50000  19.4%     -    0s
     0     0   21.00000    0   43   18.00000   21.00000  16.7%     -    0s
H    0     0                      20.0000000   21.00000  5.00%     -    0s
     0     0   21.00000    0   47   20.00000   21.00000  5.00%     -    0s
     0     0   21.00000    0   31   20.00000   21.00000  5.00%     -    0s
     0     0   21.00000    0   24   20.00000   21.00000  5.00%     -    0s
     0     0   21.00000    0   39   20.00000   21.00000  5.00%     -    0s
     0     0   21.00000    0   36   20.00000   21.00000  5.00%     -    0s
     0     2   21.00000    0   36   20.00000   21.00000  5.00%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 3

Explored 1 nodes (473 simplex iterations) in 0.03 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%