Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:20 2012

Optimize a model with 690 rows, 53 columns and 1380 nonzeros
Presolve removed 474 rows and 0 columns
Presolve time: 0.01s
Presolved: 216 rows, 53 columns, 1228 nonzeros
Variable types: 0 continuous, 53 integer (53 binary)
Found heuristic solution: objective 7.0000000

Root relaxation: objective 9.174931e+00, 117 iterations, 0.00 seconds

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

     0     0    9.17493    0   49    7.00000    9.17493  31.1%     -    0s
     0     0    8.96168    0   52    7.00000    8.96168  28.0%     -    0s
     0     0    8.88377    0   52    7.00000    8.88377  26.9%     -    0s
     0     0    8.86921    0   52    7.00000    8.86921  26.7%     -    0s
     0     0    8.86303    0   52    7.00000    8.86303  26.6%     -    0s
     0     0    8.85226    0   51    7.00000    8.85226  26.5%     -    0s
     0     0    8.85077    0   52    7.00000    8.85077  26.4%     -    0s
     0     2    8.85069    0   52    7.00000    8.85069  26.4%     -    0s
*    9     0               4       8.0000000    8.00000   0.0%  32.0    0s

Cutting planes:
  Gomory: 1
  Clique: 18
  Zero half: 10

Explored 10 nodes (572 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%