Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:16:17 2012

Optimize a model with 18833 rows, 5402 columns and 61537 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.67s
Presolved: 18831 rows, 5400 columns, 61021 nonzeros
Variable types: 0 continuous, 5400 integer (5400 binary)
Found heuristic solution: objective 73.0000000

Root relaxation: objective 2.000000e+00, 3764 iterations, 0.15 seconds

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

     0     0    2.00000    0  146   73.00000    2.00000  97.3%     -    1s
H    0     0                      66.0000000    2.00000  97.0%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 1241    5.00000    3.00000  40.0%     -   20s
     0     0    3.00709    0 3558    5.00000    3.00709  39.9%     -   22s
H    0     0                       4.0000000    3.00709  24.8%     -   25s

Cutting planes:
  Clique: 45
  Zero half: 9

Explored 0 nodes (58141 simplex iterations) in 25.34 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%