Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:40 2012

Optimize a model with 179 rows, 58 columns and 358 nonzeros
Presolve removed 57 rows and 0 columns
Presolve time: 0.00s
Presolved: 122 rows, 58 columns, 279 nonzeros
Variable types: 0 continuous, 58 integer (58 binary)
Found heuristic solution: objective 18.0000000

Root relaxation: objective 2.200000e+01, 64 iterations, 0.00 seconds

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

     0     0   22.00000    0   42   18.00000   22.00000  22.2%     -    0s
H    0     0                      19.0000000   22.00000  15.8%     -    0s
     0     0   21.53333    0   53   19.00000   21.53333  13.3%     -    0s
     0     0   21.50000    0   43   19.00000   21.50000  13.2%     -    0s
     0     0   21.42857    0   51   19.00000   21.42857  12.8%     -    0s
     0     0   21.31250    0   56   19.00000   21.31250  12.2%     -    0s
     0     0   21.22727    0   56   19.00000   21.22727  11.7%     -    0s
     0     0   21.14286    0   56   19.00000   21.14286  11.3%     -    0s
     0     0   21.13514    0   56   19.00000   21.13514  11.2%     -    0s
     0     0   21.13514    0   54   19.00000   21.13514  11.2%     -    0s
H    0     0                      20.0000000   21.13514  5.68%     -    0s
     0     1   21.00000    0   42   20.00000   21.00000  5.00%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 14

Explored 1 nodes (265 simplex iterations) in 0.02 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%