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

Optimize a model with 133 rows, 53 columns and 266 nonzeros
Presolve removed 30 rows and 2 columns
Presolve time: 0.00s
Presolved: 103 rows, 51 columns, 220 nonzeros
Variable types: 0 continuous, 51 integer (51 binary)
Found heuristic solution: objective 19.0000000

Root relaxation: objective 2.300000e+01, 58 iterations, 0.00 seconds

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

     0     0   23.00000    0   36   19.00000   23.00000  21.1%     -    0s
H    0     0                      21.0000000   23.00000  9.52%     -    0s
     0     0   22.50000    0   35   21.00000   22.50000  7.14%     -    0s
     0     0   22.42857    0   47   21.00000   22.42857  6.80%     -    0s
     0     0   22.25000    0   48   21.00000   22.25000  5.95%     -    0s
     0     0     cutoff    0        21.00000   21.99998  4.76%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 15

Explored 0 nodes (166 simplex iterations) in 0.01 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%