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

Optimize a model with 152 rows, 51 columns and 304 nonzeros
Presolve removed 51 rows and 4 columns
Presolve time: 0.00s
Presolved: 101 rows, 47 columns, 230 nonzeros
Variable types: 0 continuous, 47 integer (47 binary)
Found heuristic solution: objective 18.0000000

Root relaxation: objective 2.120000e+01, 65 iterations, 0.00 seconds

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

     0     0   21.20000    0   43   18.00000   21.20000  17.8%     -    0s
H    0     0                      19.0000000   21.20000  11.6%     -    0s
     0     0   20.85714    0   44   19.00000   20.85714  9.77%     -    0s
     0     0   20.33333    0   36   19.00000   20.33333  7.02%     -    0s
     0     0   20.25000    0   44   19.00000   20.25000  6.58%     -    0s
     0     0   20.23077    0   44   19.00000   20.23077  6.48%     -    0s
     0     0   20.18182    0   43   19.00000   20.18182  6.22%     -    0s
     0     0   20.13333    0   44   19.00000   20.13333  5.96%     -    0s
H    0     0                      20.0000000   20.13333  0.67%     -    0s

Cutting planes:
  Zero half: 18

Explored 0 nodes (155 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%