Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:51:46 2012

Optimize a model with 4982 rows, 2256 columns and 17014 nonzeros
Presolve removed 1128 rows and 0 columns
Presolve time: 0.12s
Presolved: 3854 rows, 2256 columns, 14429 nonzeros
Variable types: 0 continuous, 2256 integer (2256 binary)
Found heuristic solution: objective 27.0000000

Root relaxation: objective 3.000000e+00, 4008 iterations, 0.35 seconds

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

     0     0    3.00000    0   93   27.00000    3.00000  88.9%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  205    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   71    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   70    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   74    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   74    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   81    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   81    4.00000    3.00000  25.0%     -    7s
     0     2    3.00000    0   81    4.00000    3.00000  25.0%     -    8s
     5     5    3.00000    1   96    4.00000    3.00000  25.0%   845   11s
     8     7    3.00000    1   56    4.00000    3.00000  25.0%   528   15s
    12    10    3.00000    1  105    4.00000    3.00000  25.0%   352   21s
    17    13    3.00000   15  232    4.00000    3.00000  25.0%  5692   28s

Cutting planes:
  Gomory: 10
  Zero half: 5

Explored 21 nodes (153625 simplex iterations) in 29.92 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%