Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:07:14 2012

Optimize a model with 5831 rows, 2450 columns and 19747 nonzeros
Presolve removed 1225 rows and 0 columns
Presolve time: 0.14s
Presolved: 4606 rows, 2450 columns, 16807 nonzeros
Variable types: 0 continuous, 2450 integer (2450 binary)
Found heuristic solution: objective 28.0000000

Root relaxation: objective 3.000000e+00, 3263 iterations, 0.21 seconds

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

     0     0    3.00000    0   76   28.00000    3.00000  89.3%     -    0s
H    0     0                       5.0000000    3.00000  40.0%     -    0s
     0     0    3.00000    0  164    5.00000    3.00000  40.0%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0   88    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0  128    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  139    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   83    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0  120    4.00000    3.00000  25.0%     -    7s
     0     0    3.00000    0  127    4.00000    3.00000  25.0%     -    9s
     0     0    3.00000    0  124    4.00000    3.00000  25.0%     -    9s
     0     2    3.00000    0  124    4.00000    3.00000  25.0%     -   10s
     6     6    3.00000    1  149    4.00000    3.00000  25.0%   320   15s
     8     7    3.00000    1   81    4.00000    3.00000  25.0%   240   20s
    14     9    3.00000   15  153    4.00000    3.00000  25.0%  4274   26s

Cutting planes:
  Gomory: 18
  Zero half: 45

Explored 17 nodes (132620 simplex iterations) in 26.84 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%