Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:04:47 2012

Optimize a model with 13935 rows, 4556 columns and 46027 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.44s
Presolved: 13933 rows, 4554 columns, 45611 nonzeros
Variable types: 0 continuous, 4554 integer (4554 binary)
Found heuristic solution: objective 66.0000000

Root relaxation: objective 2.000000e+00, 3368 iterations, 0.13 seconds

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

     0     0    2.00000    0  134   66.00000    2.00000  97.0%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
     0     0    2.66667    0 1263    5.00000    2.66667  46.7%     -    3s
     0     0    2.66667    0 3851    5.00000    2.66667  46.7%     -    4s
     0     0    2.67010    0 3444    5.00000    2.67010  46.6%     -   18s
H    0     0                       4.0000000    2.67010  33.2%     -   18s
     0     0    2.67010    0 3621    4.00000    2.67010  33.2%     -   19s
     0     0    2.67010    0 3493    4.00000    2.67010  33.2%     -   29s
     0     0    3.00000    0  162    4.00000    3.00000  25.0%     -   32s
     0     0    3.00000    0  161    4.00000    3.00000  25.0%     -   32s
     0     0    3.00000    0   98    4.00000    3.00000  25.0%     -   32s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -   32s

Cutting planes:
  Zero half: 31

Explored 0 nodes (76229 simplex iterations) in 32.96 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%