Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:18 2012

Optimize a model with 631 rows, 51 columns and 1262 nonzeros
Presolve removed 433 rows and 0 columns
Presolve time: 0.01s
Presolved: 198 rows, 51 columns, 1064 nonzeros
Variable types: 0 continuous, 51 integer (51 binary)
Found heuristic solution: objective 4.0000000

Root relaxation: objective 9.293428e+00, 101 iterations, 0.00 seconds

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

     0     0    9.29343    0   47    4.00000    9.29343   132%     -    0s
H    0     0                       5.0000000    9.29343  85.9%     -    0s
H    0     0                       6.0000000    9.29343  54.9%     -    0s
H    0     0                       7.0000000    9.29343  32.8%     -    0s
     0     0    9.06092    0   47    7.00000    9.06092  29.4%     -    0s
     0     0    8.93471    0   47    7.00000    8.93471  27.6%     -    0s
     0     0    8.89095    0   50    7.00000    8.89095  27.0%     -    0s
     0     0    8.87466    0   49    7.00000    8.87466  26.8%     -    0s
     0     0    8.86546    0   48    7.00000    8.86546  26.6%     -    0s
     0     0    8.86486    0   49    7.00000    8.86486  26.6%     -    0s
     0     2    8.86422    0   49    7.00000    8.86422  26.6%     -    0s
*   15     0               2       8.0000000    8.00000   0.0%  22.7    0s

Cutting planes:
  Gomory: 1
  Clique: 13
  Zero half: 13

Explored 16 nodes (619 simplex iterations) in 0.08 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%