Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:17:39 2012

Optimize a model with 517 rows, 470 columns and 1760 nonzeros
Presolve removed 0 rows and 18 columns
Presolve time: 0.00s
Presolved: 517 rows, 452 columns, 1742 nonzeros
Variable types: 0 continuous, 452 integer (451 binary)
Found heuristic solution: objective 94.0000000

Root relaxation: objective 0.000000e+00, 241 iterations, 0.00 seconds

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

     0     0    0.00000    0  187   94.00000    0.00000   100%     -    0s
H    0     0                      61.0000000    0.00000   100%     -    0s
H    0     0                      60.0000000    0.00000   100%     -    0s
     0     0    0.40532    0  189   60.00000    0.40532  99.3%     -    0s
H    0     0                      39.0000000    0.40532  99.0%     -    0s
     0     0    0.80157    0  190   39.00000    0.80157  97.9%     -    0s
     0     0    0.80189    0  191   39.00000    0.80189  97.9%     -    0s
     0     2    0.80935    0  191   39.00000    0.80935  97.9%     -    0s
H   27    27                      36.0000000    1.00000  97.2%  35.1    0s
H   54    46                      20.0000000    1.00000  95.0%  25.9    0s
*   63    36              45      19.0000000    1.00000  94.7%  28.8    0s
*  641   227              30      18.0000000    8.17061  54.6%  36.0    1s

Explored 1723 nodes (57782 simplex iterations) in 2.63 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.800000000000e+01, best bound 1.800000000000e+01, gap 0.0%