Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:16 2012

Optimize a model with 539 rows, 48 columns and 1078 nonzeros
Presolve removed 376 rows and 0 columns
Presolve time: 0.01s
Presolved: 163 rows, 48 columns, 868 nonzeros
Variable types: 0 continuous, 48 integer (48 binary)
Found heuristic solution: objective 6.0000000

Root relaxation: objective 8.978508e+00, 73 iterations, 0.00 seconds

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

     0     0    8.97851    0   41    6.00000    8.97851  49.6%     -    0s
H    0     0                       7.0000000    8.97851  28.3%     -    0s
     0     0    8.77063    0   41    7.00000    8.77063  25.3%     -    0s
H    0     0                       8.0000000    8.77063  9.63%     -    0s

Cutting planes:
  Clique: 7
  Zero half: 7

Explored 0 nodes (128 simplex iterations) in 0.02 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%