Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:36:41 2012

Optimize a model with 4950 rows, 2070 columns and 16740 nonzeros
Presolve removed 1440 rows and 0 columns
Presolve time: 0.11s
Presolved: 3510 rows, 2070 columns, 13320 nonzeros
Variable types: 0 continuous, 2070 integer (2070 binary)
Found heuristic solution: objective 25.0000000

Root relaxation: objective 3.000000e+00, 3200 iterations, 0.22 seconds

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

     0     0    3.00000    0   76   25.00000    3.00000  88.0%     -    1s
H    0     0                       5.0000000    3.00000  40.0%     -    1s
     0     0    3.00000    0  172    5.00000    3.00000  40.0%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0   88    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0  135    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   78    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   73    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   60    4.00000    3.00000  25.0%     -    7s
     0     0    3.00000    0  109    4.00000    3.00000  25.0%     -    8s
     0     0    3.00000    0  109    4.00000    3.00000  25.0%     -    8s
     0     2    3.00000    0  109    4.00000    3.00000  25.0%     -    9s
     4     4    3.00000    1   62    4.00000    3.00000  25.0%   405   10s
     8     7    3.00000    1   77    4.00000    3.00000  25.0%   202   16s
    11     9    3.00000    1  100    4.00000    3.00000  25.0%   147   20s

Cutting planes:
  Gomory: 3
  Zero half: 6

Explored 19 nodes (134439 simplex iterations) in 24.92 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%