Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:23 2012

Optimize a model with 771 rows, 56 columns and 1542 nonzeros
Presolve removed 538 rows and 0 columns
Presolve time: 0.01s
Presolved: 233 rows, 56 columns, 1384 nonzeros
Variable types: 0 continuous, 56 integer (56 binary)
Found heuristic solution: objective 7.0000000

Root relaxation: objective 9.782443e+00, 119 iterations, 0.00 seconds

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

     0     0    9.78244    0   48    7.00000    9.78244  39.7%     -    0s
H    0     0                       8.0000000    9.78244  22.3%     -    0s
     0     0    9.50702    0   52    8.00000    9.50702  18.8%     -    0s
     0     0    9.43165    0   52    8.00000    9.43165  17.9%     -    0s
     0     0    9.36156    0   53    8.00000    9.36156  17.0%     -    0s
     0     0    9.32527    0   53    8.00000    9.32527  16.6%     -    0s
     0     0    9.32360    0   54    8.00000    9.32360  16.5%     -    0s
     0     0    9.32172    0   54    8.00000    9.32172  16.5%     -    0s
     0     2    9.31355    0   54    8.00000    9.31355  16.4%     -    0s

Cutting planes:
  Clique: 22
  Zero half: 6

Explored 7 nodes (420 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%