Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:16:41 2012

Optimize a model with 21015 rows, 5550 columns and 68226 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.72s
Presolved: 21087 rows, 5548 columns, 73134 nonzeros
Variable types: 0 continuous, 5548 integer (5548 binary)
Found heuristic solution: objective 74.0000000

Root relaxation: objective 2.000000e+00, 3976 iterations, 0.18 seconds

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

     0     0    2.00000    0  148   74.00000    2.00000  97.3%     -    1s
H    0     0                      73.0000000    2.00000  97.3%     -    1s
H    0     0                       6.0000000    2.00000  66.7%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 3982    5.00000    3.00000  40.0%     -   15s
     0     0    3.00000    0 3505    5.00000    3.00000  40.0%     -   18s
H    0     0                       4.0000000    3.00000  25.0%     -   20s
     0     0    3.00000    0 3509    4.00000    3.00000  25.0%     -   21s
     0     0    3.00000    0 2843    4.00000    3.00000  25.0%     -   31s
     0     0    3.00000    0 3518    4.00000    3.00000  25.0%     -   41s
     0     0    3.00000    0 3070    4.00000    3.00000  25.0%     -   51s

Cutting planes:
  Clique: 46
  Zero half: 3

Explored 0 nodes (123579 simplex iterations) in 60.44 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%