Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:02:01 2012

Optimize a model with 13600 rows, 4556 columns and 45022 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.42s
Presolved: 13598 rows, 4554 columns, 44616 nonzeros
Variable types: 0 continuous, 4554 integer (4554 binary)
Found heuristic solution: objective 67.0000000

Root relaxation: objective 2.000000e+00, 3271 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   67.00000    2.00000  97.0%     -    0s
H    0     0                      66.0000000    2.00000  97.0%     -    0s
H    0     0                       4.0000000    2.00000  50.0%     -    0s
     0     0    2.66667    0 1443    4.00000    2.66667  33.3%     -    2s
     0     0    2.66667    0 3713    4.00000    2.66667  33.3%     -    3s
     0     0    2.66667    0  154    4.00000    2.66667  33.3%     -   18s
     0     0    2.67010    0 3480    4.00000    2.67010  33.2%     -   27s
     0     0    2.67010    0 3248    4.00000    2.67010  33.2%     -   39s
     0     0    3.00000    0  137    4.00000    3.00000  25.0%     -   42s
     0     0    3.00000    0  120    4.00000    3.00000  25.0%     -   42s
     0     0    3.00000    0  134    4.00000    3.00000  25.0%     -   42s
     0     0    3.00000    0  144    4.00000    3.00000  25.0%     -   42s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -   42s

Cutting planes:
  Zero half: 46

Explored 0 nodes (107813 simplex iterations) in 42.82 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%