Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:14:50 2012

Optimize a model with 3353 rows, 1560 columns and 11425 nonzeros
Presolve removed 1055 rows and 2 columns
Presolve time: 0.10s
Presolved: 2337 rows, 1558 columns, 10488 nonzeros
Variable types: 0 continuous, 1558 integer (1558 binary)
Found heuristic solution: objective 39.0000000

Root relaxation: objective 3.000000e+00, 2552 iterations, 0.22 seconds

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

     0     0    3.00000    0   42   39.00000    3.00000  92.3%     -    1s
H    0     0                      20.0000000    3.00000  85.0%     -    1s
H    0     0                       9.0000000    3.00000  66.7%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  517    4.00000    3.00000  25.0%     -    1s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -    1s

Cutting planes:
  Gomory: 1
  Zero half: 27

Explored 0 nodes (11450 simplex iterations) in 1.59 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%