Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:08:52 2012

Optimize a model with 2244 rows, 1122 columns and 7722 nonzeros
Presolve removed 495 rows and 0 columns
Presolve time: 0.04s
Presolved: 1749 rows, 1122 columns, 6501 nonzeros
Variable types: 0 continuous, 1122 integer (1122 binary)
Found heuristic solution: objective 21.0000000

Root relaxation: objective 3.000000e+00, 1468 iterations, 0.05 seconds

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

     0     0    3.00000    0   66   21.00000    3.00000  85.7%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0  168    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   50    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   49    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   51    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   37    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   86    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   47    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   86    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   86    4.00000    3.00000  25.0%     -    1s
     0     2    3.00000    0   86    4.00000    3.00000  25.0%     -    1s
    18    12    3.00000   16   34    4.00000    3.00000  25.0%  1795    5s

Cutting planes:
  Gomory: 2
  Clique: 2
  Zero half: 2

Explored 21 nodes (54607 simplex iterations) in 5.16 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%