Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:16:09 2012

Optimize a model with 3479 rows, 1640 columns and 11878 nonzeros
Presolve removed 602 rows and 2 columns
Presolve time: 0.10s
Presolved: 2877 rows, 1638 columns, 10374 nonzeros
Variable types: 0 continuous, 1638 integer (1638 binary)
Found heuristic solution: objective 40.0000000

Root relaxation: objective 3.000000e+00, 2141 iterations, 0.14 seconds

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

     0     0    3.00000    0   48   40.00000    3.00000  92.5%     -    0s
H    0     0                      28.0000000    3.00000  89.3%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0   44    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   94    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0  111    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   74    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   42    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   44    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   72    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   84    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   69    4.00000    3.00000  25.0%     -    5s
     0     2    3.00000    0   69    4.00000    3.00000  25.0%     -    5s
     9     8    3.00000    1   88    4.00000    3.00000  25.0%   111   10s

Cutting planes:
  Gomory: 11
  Zero half: 5

Explored 14 nodes (82294 simplex iterations) in 11.32 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%