Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:13:24 2012

Optimize a model with 6173 rows, 2450 columns and 20725 nonzeros
Presolve removed 1815 rows and 2 columns
Presolve time: 0.13s
Presolved: 4407 rows, 2448 columns, 18734 nonzeros
Variable types: 0 continuous, 2448 integer (2448 binary)
Found heuristic solution: objective 48.0000000

Root relaxation: objective 3.000000e+00, 4646 iterations, 0.71 seconds

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

     0     0    3.00000    0  118   48.00000    3.00000  93.8%     -    3s
H    0     0                       4.0000000    3.00000  25.0%     -    3s
     0     0    3.00000    0  115    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0  125    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   97    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  113    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0  102    4.00000    3.00000  25.0%     -    8s
     0     0    3.00000    0  117    4.00000    3.00000  25.0%     -    9s
     0     0    3.00000    0   98    4.00000    3.00000  25.0%     -   11s
     0     0    3.00000    0  109    4.00000    3.00000  25.0%     -   11s
     0     0    3.00000    0  107    4.00000    3.00000  25.0%     -   12s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -   13s

Cutting planes:
  Gomory: 3
  Zero half: 123

Explored 0 nodes (70969 simplex iterations) in 13.14 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%