Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:06:44 2012

Optimize a model with 13600 rows, 4556 columns and 45022 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.42s
Presolved: 13665 rows, 4554 columns, 49105 nonzeros
Variable types: 0 continuous, 4554 integer (4554 binary)
Found heuristic solution: objective 67.0000000

Root relaxation: objective 2.000000e+00, 3290 iterations, 0.12 seconds

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

     0     0    2.00000    0  134   67.00000    2.00000  97.0%     -    0s
H    0     0                      53.0000000    2.00000  96.2%     -    0s
H    0     0                       4.0000000    2.00000  50.0%     -    0s
     0     0    2.66667    0 1382    4.00000    2.66667  33.3%     -    2s
     0     0    2.67358    0 3733    4.00000    2.67358  33.2%     -    4s
     0     0    3.00000    0  122    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  135    4.00000    3.00000  25.0%     -    5s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -    5s

Cutting planes:
  Gomory: 5
  Zero half: 80

Explored 0 nodes (19607 simplex iterations) in 5.19 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%