Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:40:07 2012

Optimize a model with 11741 rows, 3540 columns and 38527 nonzeros
Presolve time: 0.10s
Presolved: 11741 rows, 3540 columns, 38863 nonzeros
Variable types: 0 continuous, 3540 integer (3540 binary)
Found heuristic solution: objective 37.0000000

Root relaxation: objective 2.000000e+00, 3552 iterations, 0.14 seconds

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

     0     0    2.00000    0  118   37.00000    2.00000  94.6%     -    1s
H    0     0                      12.0000000    2.00000  83.3%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    2.00000    0  118    5.00000    2.00000  60.0%     -    2s
     0     0    2.00000    0  118    5.00000    2.00000  60.0%     -    6s
     0     0    2.00000    0  118    5.00000    2.00000  60.0%     -   12s
     0     0    2.00000    0  118    5.00000    2.00000  60.0%     -   16s
     0     0    2.00000    0  118    5.00000    2.00000  60.0%     -   20s
     0     0    2.00000    0  118    5.00000    2.00000  60.0%     -   24s
     0     2    2.00000    0  118    5.00000    2.00000  60.0%     -   36s
     1     3    3.00000    1  640    5.00000    2.00000  60.0% 21743   42s
     2     4    3.00000    1  524    5.00000    3.00000  40.0% 14154   45s
*   27     6              20       4.0000000    3.00000  25.0%  1226   45s
    36     3     cutoff    5         4.00000    3.00000  25.0%  1371   50s
    44     3     cutoff    5         4.00000    3.00000  25.0%  1541   55s
    52     3     cutoff    5         4.00000    3.00000  25.0%  1656   61s

Cutting planes:
  Clique: 137

Explored 66 nodes (167219 simplex iterations) in 64.98 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%