Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:38 2012

Optimize a model with 145 rows, 51 columns and 290 nonzeros
Presolve removed 38 rows and 0 columns
Presolve time: 0.00s
Presolved: 107 rows, 51 columns, 240 nonzeros
Variable types: 0 continuous, 51 integer (51 binary)
Found heuristic solution: objective 17.0000000

Root relaxation: objective 2.166667e+01, 76 iterations, 0.00 seconds

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

     0     0   21.66667    0   48   17.00000   21.66667  27.5%     -    0s
H    0     0                      20.0000000   21.66667  8.33%     -    0s
     0     0     cutoff    0        20.00000   20.99998  5.00%     -    0s

Cutting planes:
  Gomory: 3
  Zero half: 26

Explored 0 nodes (139 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%