Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:44:32 2012

Optimize a model with 5106 rows, 2162 columns and 17296 nonzeros
Presolve removed 1012 rows and 0 columns
Presolve time: 0.11s
Presolved: 4094 rows, 2162 columns, 14996 nonzeros
Variable types: 0 continuous, 2162 integer (2162 binary)
Found heuristic solution: objective 27.0000000

Root relaxation: objective 3.000000e+00, 4184 iterations, 0.39 seconds

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

     0     0    3.00000    0   54   27.00000    3.00000  88.9%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  145    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   88    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   89    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   91    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  100    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  135    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0  134    4.00000    3.00000  25.0%     -    6s
     0     2    3.00000    0   56    4.00000    3.00000  25.0%     -    7s
     5     5    3.00000    1   46    4.00000    3.00000  25.0%   474   11s
     8     7    3.00000    1   87    4.00000    3.00000  25.0%   296   15s
    12    10    3.00000    1   50    4.00000    3.00000  25.0%   198   20s
    16    12    3.00000    1  108    4.00000    3.00000  25.0%   148   28s
    20    15    3.00000   10  104    4.00000    3.00000  25.0%  6296   30s

Cutting planes:
  Gomory: 4
  Zero half: 3

Explored 27 nodes (177486 simplex iterations) in 32.77 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%