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

Optimize a model with 176 rows, 56 columns and 352 nonzeros
Presolve removed 65 rows and 3 columns
Presolve time: 0.00s
Presolved: 111 rows, 53 columns, 257 nonzeros
Variable types: 0 continuous, 53 integer (53 binary)
Found heuristic solution: objective 18.0000000

Root relaxation: objective 2.200000e+01, 69 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
     0     0   21.63636    0   50   18.00000   21.63636  20.2%     -    0s
H    0     0                      20.0000000   21.63636  8.18%     -    0s
     0     0   21.42857    0   50   20.00000   21.42857  7.14%     -    0s
     0     0   21.42105    0   49   20.00000   21.42105  7.11%     -    0s
     0     0   21.33333    0   46   20.00000   21.33333  6.67%     -    0s
H    0     0                      21.0000000   21.33333  1.59%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 11

Explored 0 nodes (157 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0%