Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:14:52 2012

Optimize a model with 3080 rows, 1560 columns and 10606 nonzeros
Presolve removed 470 rows and 2 columns
Presolve time: 0.10s
Presolved: 2649 rows, 1558 columns, 10979 nonzeros
Variable types: 0 continuous, 1558 integer (1558 binary)
Found heuristic solution: objective 39.0000000

Root relaxation: objective 3.000000e+00, 1900 iterations, 0.11 seconds

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

     0     0    3.00000    0   36   39.00000    3.00000  92.3%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0   90    4.00000    3.00000  25.0%     -    0s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -    0s

Cutting planes:
  Zero half: 27

Explored 0 nodes (7921 simplex iterations) in 0.66 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%