Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:26:24 2012

Optimize a model with 6578 rows, 2652 columns and 22132 nonzeros
Presolve removed 1788 rows and 53 columns
Presolve time: 0.17s
Presolved: 4790 rows, 2599 columns, 17813 nonzeros
Variable types: 0 continuous, 2599 integer (2599 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 3.000000e+00, 5047 iterations, 0.77 seconds

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

     0     0    3.00000    0  109   51.00000    3.00000  94.1%     -    2s
H    0     0                      48.0000000    3.00000  93.8%     -    2s
H    0     0                      32.0000000    3.00000  90.6%     -    2s
H    0     0                       5.0000000    3.00000  40.0%     -    2s
     0     0    3.00000    0  593    5.00000    3.00000  40.0%     -    2s
     0     0    3.00000    0   56    5.00000    3.00000  40.0%     -    5s
H    0     0                       4.0000000    3.00000  25.0%     -    5s
     0     0    3.00000    0   62    4.00000    3.00000  25.0%     -    7s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -    7s

Cutting planes:
  Zero half: 17

Explored 0 nodes (39784 simplex iterations) in 7.60 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%