Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:23:01 2012

Optimize a model with 4031 rows, 1806 columns and 13690 nonzeros
Presolve removed 968 rows and 2 columns
Presolve time: 0.11s
Presolved: 3063 rows, 1804 columns, 11276 nonzeros
Variable types: 0 continuous, 1804 integer (1804 binary)
Found heuristic solution: objective 42.0000000

Root relaxation: objective 3.000000e+00, 3024 iterations, 0.25 seconds

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

     0     0    3.00000    0  708   42.00000    3.00000  92.9%     -    0s
H    0     0                      37.0000000    3.00000  91.9%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0  100    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0  100    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   83    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   85    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   73    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   62    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   91    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   93    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   91    4.00000    3.00000  25.0%     -    6s
     0     2    3.00000    0   88    4.00000    3.00000  25.0%     -    6s
     5     5    3.00000    1   52    4.00000    3.00000  25.0%   253   10s
     9     8    3.00000    1   85    4.00000    3.00000  25.0%   140   15s

Cutting planes:
  Gomory: 4
  Zero half: 11

Explored 18 nodes (90700 simplex iterations) in 18.98 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%