Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:43:33 2012

Optimize a model with 18647 rows, 5256 columns and 60838 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.66s
Presolved: 18717 rows, 5254 columns, 65504 nonzeros
Variable types: 0 continuous, 5254 integer (5254 binary)
Found heuristic solution: objective 72.0000000

Root relaxation: objective 2.000000e+00, 3751 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                      67.0000000    2.00000  97.0%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 3471    5.00000    3.00000  40.0%     -   19s
     0     0    3.00000    0 2823    5.00000    3.00000  40.0%     -   23s
     0     0    3.00000    0 2509    5.00000    3.00000  40.0%     -   24s
     0     0    3.00000    0 1391    5.00000    3.00000  40.0%     -   26s
H    0     0                       4.0000000    3.00000  25.0%     -   27s
     0     0    3.00000    0 2479    4.00000    3.00000  25.0%     -   28s
     0     0    3.00000    0 3402    4.00000    3.00000  25.0%     -   35s

Cutting planes:
  Clique: 43
  Zero half: 4

Explored 0 nodes (87190 simplex iterations) in 41.33 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%