Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:40 2012

Optimize a model with 162 rows, 57 columns and 324 nonzeros
Presolve removed 39 rows and 0 columns
Presolve time: 0.00s
Presolved: 123 rows, 57 columns, 271 nonzeros
Variable types: 0 continuous, 57 integer (57 binary)
Found heuristic solution: objective 17.0000000

Root relaxation: objective 2.325000e+01, 83 iterations, 0.00 seconds

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

     0     0   23.25000    0   47   17.00000   23.25000  36.8%     -    0s
H    0     0                      18.0000000   23.25000  29.2%     -    0s
     0     0   22.62500    0   43   18.00000   22.62500  25.7%     -    0s
H    0     0                      19.0000000   22.62500  19.1%     -    0s
     0     0   22.00000    0   45   19.00000   22.00000  15.8%     -    0s
H    0     0                      21.0000000   22.00000  4.76%     -    0s
     0     0   22.00000    0   44   21.00000   22.00000  4.76%     -    0s
     0     0   22.00000    0   42   21.00000   22.00000  4.76%     -    0s
     0     0   22.00000    0   42   21.00000   22.00000  4.76%     -    0s
     0     0   22.00000    0   39   21.00000   22.00000  4.76%     -    0s
     0     0   22.00000    0   40   21.00000   22.00000  4.76%     -    0s
     0     0   22.00000    0   38   21.00000   22.00000  4.76%     -    0s
     0     2   22.00000    0   38   21.00000   22.00000  4.76%     -    0s

Explored 3 nodes (493 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0%