Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:31:42 2012

Optimize a model with 4400 rows, 1980 columns and 15004 nonzeros
Presolve removed 881 rows and 44 columns
Presolve time: 0.10s
Presolved: 3519 rows, 1936 columns, 12936 nonzeros
Variable types: 0 continuous, 1936 integer (1936 binary)
Found heuristic solution: objective 22.0000000

Root relaxation: objective 3.000000e+00, 3827 iterations, 0.26 seconds

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

     0     0    3.00000    0   82   22.00000    3.00000  86.4%     -    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   42    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0  101    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   85    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   72    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   76    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   75    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   76    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  111    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0  111    4.00000    3.00000  25.0%     -    6s
     0     2    3.00000    0  111    4.00000    3.00000  25.0%     -    8s
     5     5    3.00000    1   71    4.00000    3.00000  25.0%   526   10s
    10     8    3.00000   10   56    4.00000    3.00000  25.0%  3626   15s

Cutting planes:
  Gomory: 3
  Zero half: 4

Explored 15 nodes (98268 simplex iterations) in 15.92 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%