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

Optimize a model with 153 rows, 55 columns and 306 nonzeros
Presolve removed 61 rows and 9 columns
Presolve time: 0.00s
Presolved: 92 rows, 46 columns, 201 nonzeros
Variable types: 0 continuous, 46 integer (46 binary)
Found heuristic solution: objective 20.0000000

Root relaxation: objective 2.366667e+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   23.66667    0   45   20.00000   23.66667  18.3%     -    0s
H    0     0                      21.0000000   23.66667  12.7%     -    0s
     0     0   22.84615    0   45   21.00000   22.84615  8.79%     -    0s
     0     0   22.50000    0   44   21.00000   22.50000  7.14%     -    0s
     0     0   22.50000    0   29   21.00000   22.50000  7.14%     -    0s
H    0     0                      22.0000000   22.50000  2.27%     -    0s

Cutting planes:
  Zero half: 14

Explored 0 nodes (114 simplex iterations) in 0.01 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%