Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:13:32 2012

Optimize a model with 3315 rows, 1560 columns and 11349 nonzeros
Presolve removed 1053 rows and 0 columns
Presolve time: 0.06s
Presolved: 2262 rows, 1560 columns, 9009 nonzeros
Variable types: 0 continuous, 1560 integer (1560 binary)
Found heuristic solution: objective 20.0000000

Root relaxation: objective 3.000000e+00, 2712 iterations, 0.18 seconds

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

     0     0    3.00000    0   44   20.00000    3.00000  85.0%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0  152    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   71    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   70    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   69    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0  104    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   69    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   68    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   70    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  120    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   73    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  113    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0  113    4.00000    3.00000  25.0%     -    6s
     0     2    3.00000    0  108    4.00000    3.00000  25.0%     -    7s
     8     7    3.00000    1   68    4.00000    3.00000  25.0%   324   10s

Cutting planes:
  Gomory: 4
  Zero half: 5

Explored 16 nodes (98939 simplex iterations) in 12.81 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%