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

Optimize a model with 142 rows, 52 columns and 284 nonzeros
Presolve removed 45 rows and 1 columns
Presolve time: 0.00s
Presolved: 97 rows, 51 columns, 218 nonzeros
Variable types: 0 continuous, 51 integer (51 binary)
Found heuristic solution: objective 19.0000000

Root relaxation: objective 2.157143e+01, 72 iterations, 0.00 seconds

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

     0     0   21.57143    0   46   19.00000   21.57143  13.5%     -    0s
H    0     0                      20.0000000   21.57143  7.86%     -    0s
     0     0   21.00000    0   47   20.00000   21.00000  5.00%     -    0s
     0     0   21.00000    0   47   20.00000   21.00000  5.00%     -    0s
     0     0   21.00000    0   29   20.00000   21.00000  5.00%     -    0s
     0     2   21.00000    0   29   20.00000   21.00000  5.00%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 5

Explored 1 nodes (192 simplex iterations) in 0.02 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%