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

Optimize a model with 146 rows, 54 columns and 292 nonzeros
Presolve removed 43 rows and 4 columns
Presolve time: 0.00s
Presolved: 103 rows, 50 columns, 224 nonzeros
Variable types: 0 continuous, 50 integer (50 binary)
Found heuristic solution: objective 20.0000000

Root relaxation: objective 2.400000e+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   24.00000    0   42   20.00000   24.00000  20.0%     -    0s
     0     0   23.50000    0   47   20.00000   23.50000  17.5%     -    0s
H    0     0                      21.0000000   23.50000  11.9%     -    0s
     0     0   23.00000    0   47   21.00000   23.00000  9.52%     -    0s
     0     0   22.78571    0   46   21.00000   22.78571  8.50%     -    0s
     0     0   22.33333    0   47   21.00000   22.33333  6.35%     -    0s
     0     0   22.00000    0   45   21.00000   22.00000  4.76%     -    0s
H    0     0                      22.0000000   22.00000   0.0%     -    0s

Cutting planes:
  Zero half: 16

Explored 0 nodes (182 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.200000000000e+01, best bound 2.200000000000e+01, gap 0.0%