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

Optimize a model with 138 rows, 53 columns and 276 nonzeros
Presolve removed 32 rows and 0 columns
Presolve time: 0.00s
Presolved: 106 rows, 53 columns, 233 nonzeros
Variable types: 0 continuous, 53 integer (53 binary)
Found heuristic solution: objective 20.0000000

Root relaxation: objective 2.300000e+01, 67 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   34   20.00000   23.00000  15.0%     -    0s
H    0     0                      21.0000000   23.00000  9.52%     -    0s
     0     0   22.50000    0   31   21.00000   22.50000  7.14%     -    0s
H    0     0                      22.0000000   22.50000  2.27%     -    0s

Cutting planes:
  Zero half: 3

Explored 0 nodes (103 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%