Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:43:25 2012

Optimize a model with 17407 rows, 4692 columns and 56574 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.56s
Presolved: 17473 rows, 4690 columns, 60686 nonzeros
Variable types: 0 continuous, 4690 integer (4690 binary)
Found heuristic solution: objective 68.0000000

Root relaxation: objective 2.000000e+00, 3260 iterations, 0.12 seconds

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

     0     0    2.00000    0  136   68.00000    2.00000  97.1%     -    1s
H    0     0                      57.0000000    2.00000  96.5%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 2995    5.00000    3.00000  40.0%     -    9s
     0     0    3.00000    0 2272    5.00000    3.00000  40.0%     -   12s
H    0     0                       4.0000000    3.00000  25.0%     -   14s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -   17s

Cutting planes:
  Clique: 102
  Zero half: 1

Explored 0 nodes (32220 simplex iterations) in 17.06 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%