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

Optimize a model with 161 rows, 54 columns and 322 nonzeros
Presolve removed 43 rows and 0 columns
Presolve time: 0.00s
Presolved: 118 rows, 54 columns, 265 nonzeros
Variable types: 0 continuous, 54 integer (54 binary)
Found heuristic solution: objective 19.0000000

Root relaxation: objective 2.150000e+01, 80 iterations, 0.00 seconds

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

     0     0   21.50000    0   49   19.00000   21.50000  13.2%     -    0s
     0     0   20.79167    0   49   19.00000   20.79167  9.43%     -    0s
     0     0   20.66667    0   50   19.00000   20.66667  8.77%     -    0s
H    0     0                      20.0000000   20.66667  3.33%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 10

Explored 0 nodes (163 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%