Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:17 2012

Optimize a model with 620 rows, 49 columns and 1240 nonzeros
Presolve removed 432 rows and 0 columns
Presolve time: 0.01s
Presolved: 188 rows, 49 columns, 1104 nonzeros
Variable types: 0 continuous, 49 integer (49 binary)
Found heuristic solution: objective 5.0000000

Root relaxation: objective 9.104623e+00, 120 iterations, 0.00 seconds

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

     0     0    9.10462    0   41    5.00000    9.10462  82.1%     -    0s
H    0     0                       6.0000000    9.10462  51.7%     -    0s
H    0     0                       7.0000000    9.10462  30.1%     -    0s
     0     0    8.74242    0   42    7.00000    8.74242  24.9%     -    0s
H    0     0                       8.0000000    8.74242  9.28%     -    0s

Cutting planes:
  Clique: 6
  Zero half: 3

Explored 0 nodes (170 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%