Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:15 2012

Optimize a model with 507 rows, 45 columns and 1014 nonzeros
Presolve removed 363 rows and 0 columns
Presolve time: 0.01s
Presolved: 144 rows, 45 columns, 795 nonzeros
Variable types: 0 continuous, 45 integer (45 binary)
Found heuristic solution: objective 5.0000000

Root relaxation: objective 8.567715e+00, 97 iterations, 0.00 seconds

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

     0     0    8.56772    0   36    5.00000    8.56772  71.4%     -    0s
H    0     0                       6.0000000    8.56772  42.8%     -    0s
     0     0    7.99004    0   42    6.00000    7.99004  33.2%     -    0s
     0     0    7.95086    0   41    6.00000    7.95086  32.5%     -    0s
     0     0    7.92001    0   43    6.00000    7.92001  32.0%     -    0s
     0     0    7.90240    0   42    6.00000    7.90240  31.7%     -    0s
     0     0    7.90054    0   41    6.00000    7.90054  31.7%     -    0s
     0     0    7.90001    0   42    6.00000    7.90001  31.7%     -    0s
     0     2    7.89705    0   42    6.00000    7.89705  31.6%     -    0s

Cutting planes:
  Gomory: 1
  Clique: 21
  Zero half: 2

Explored 17 nodes (529 simplex iterations) in 0.05 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.000000000000e+00, best bound 6.000000000000e+00, gap 0.0%