Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:08:45 2012

Optimize a model with 3012 rows, 552 columns and 9474 nonzeros
Presolve removed 265 rows and 2 columns
Presolve time: 0.07s
Presolved: 2747 rows, 550 columns, 15465 nonzeros
Variable types: 0 continuous, 550 integer (550 binary)
Found heuristic solution: objective 23.0000000
Warning: Markowitz tolerance tightened to 0.03125

Root relaxation: objective 6.000000e+00, 2117 iterations, 0.24 seconds

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

     0     0    6.00000    0   14   23.00000    6.00000  73.9%     -    0s
H    0     0                      13.0000000    6.00000  53.8%     -    0s
H    0     0                       7.0000000    6.00000  14.3%     -    0s
     0     0    6.00000    0  107    7.00000    6.00000  14.3%     -    0s
*    0     0               0       6.0000000    6.00000   0.0%     -    0s

Cutting planes:
  Gomory: 4
  Clique: 2
  Zero half: 1

Explored 0 nodes (6438 simplex iterations) in 0.85 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%