Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:35:47 2012

Optimize a model with 4770 rows, 2070 columns and 16200 nonzeros
Presolve removed 990 rows and 0 columns
Presolve time: 0.10s
Presolved: 3780 rows, 2070 columns, 13860 nonzeros
Variable types: 0 continuous, 2070 integer (2070 binary)
Found heuristic solution: objective 27.0000000

Root relaxation: objective 3.000000e+00, 4100 iterations, 0.34 seconds

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

     0     0    3.00000    0   74   27.00000    3.00000  88.9%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  145    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0  115    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0  117    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  133    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  114    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   83    4.00000    3.00000  25.0%     -    8s
     0     0    3.00000    0   86    4.00000    3.00000  25.0%     -    9s
     0     0    3.00000    0   86    4.00000    3.00000  25.0%     -    9s
     0     2    3.00000    0   86    4.00000    3.00000  25.0%     -   10s
     7     6    3.00000    1   70    4.00000    3.00000  25.0%   388   15s
    12    10    3.00000   12   62    4.00000    3.00000  25.0%  4432   20s

Cutting planes:
  Gomory: 1
  Zero half: 6

Explored 15 nodes (124665 simplex iterations) in 20.63 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%