Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:33:20 2012

Optimize a model with 19439 rows, 5256 columns and 63214 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.69s
Presolved: 19437 rows, 5254 columns, 62674 nonzeros
Variable types: 0 continuous, 5254 integer (5254 binary)
Found heuristic solution: objective 72.0000000

Root relaxation: objective 2.000000e+00, 3809 iterations, 0.17 seconds

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

     0     0    2.00000    0  144   72.00000    2.00000  97.2%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 2832    5.00000    3.00000  40.0%     -   28s
     0     0    3.00000    0 1917    5.00000    3.00000  40.0%     -   30s
     0     0    3.00000    0 1919    5.00000    3.00000  40.0%     -   32s
     0     0    3.00000    0 1919    5.00000    3.00000  40.0%     -   39s
     0     2    3.00000    0  170    5.00000    3.00000  40.0%     -   60s
     1     3    3.00358    1 3433    5.00000    3.00000  40.0% 43097   66s
H   27     3                       4.0000000    3.25000  18.8%  1966   68s

Cutting planes:
  Clique: 70
  Zero half: 1

Explored 27 nodes (141959 simplex iterations) in 68.08 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%