Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:33:16 2012

Optimize a model with 4179 rows, 1980 columns and 14298 nonzeros
Presolve removed 883 rows and 46 columns
Presolve time: 0.10s
Presolved: 3296 rows, 1934 columns, 12124 nonzeros
Variable types: 0 continuous, 1934 integer (1934 binary)
Found heuristic solution: objective 44.0000000

Root relaxation: objective 3.000000e+00, 3215 iterations, 0.28 seconds

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

     0     0    3.00000    0   73   44.00000    3.00000  93.2%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  225    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   60    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   44    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   54    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   42    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   56    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   50    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   54    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   54    4.00000    3.00000  25.0%     -    6s
     0     2    3.00000    0   54    4.00000    3.00000  25.0%     -    7s
     5     5    3.00000    1   46    4.00000    3.00000  25.0%   483   10s
    10     8    3.00000    1   89    4.00000    3.00000  25.0%   242   16s

Cutting planes:
  Gomory: 13
  Zero half: 8

Explored 17 nodes (106818 simplex iterations) in 19.95 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%