Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:21:32 2012

Optimize a model with 6799 rows, 2550 columns and 22698 nonzeros
Presolve removed 1652 rows and 2 columns
Presolve time: 0.16s
Presolved: 5197 rows, 2548 columns, 21292 nonzeros
Variable types: 0 continuous, 2548 integer (2548 binary)
Found heuristic solution: objective 50.0000000

Root relaxation: objective 3.000000e+00, 5086 iterations, 0.76 seconds

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

     0     0    3.00000    0  108   50.00000    3.00000  94.0%     -    3s
H    0     0                       4.0000000    3.00000  25.0%     -    3s
     0     0    3.00000    0  126    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  121    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0  101    4.00000    3.00000  25.0%     -    8s
     0     0    3.00000    0  106    4.00000    3.00000  25.0%     -   10s
     0     0    3.00000    0   82    4.00000    3.00000  25.0%     -   12s
     0     0    3.00000    0   89    4.00000    3.00000  25.0%     -   14s
     0     0    3.00000    0   92    4.00000    3.00000  25.0%     -   16s
     0     0    3.00000    0   86    4.00000    3.00000  25.0%     -   17s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -   17s

Cutting planes:
  Zero half: 34

Explored 0 nodes (88670 simplex iterations) in 17.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%