Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:25:47 2012

Optimize a model with 4257 rows, 1892 columns and 14491 nonzeros
Presolve removed 1075 rows and 0 columns
Presolve time: 0.09s
Presolved: 3182 rows, 1892 columns, 11911 nonzeros
Variable types: 0 continuous, 1892 integer (1892 binary)
Found heuristic solution: objective 23.0000000

Root relaxation: objective 3.000000e+00, 3128 iterations, 0.23 seconds

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

     0     0    3.00000    0   59   23.00000    3.00000  87.0%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0  109    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0  120    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   52    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0  120    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   76    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0  122    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  122    4.00000    3.00000  25.0%     -    4s
     0     2    3.00000    0  122    4.00000    3.00000  25.0%     -    5s
     7     6    3.00000    1   94    4.00000    3.00000  25.0%   427   10s

Cutting planes:
  Gomory: 3
  Zero half: 3

Explored 26 nodes (80277 simplex iterations) in 14.21 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%