Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:37:06 2012

Optimize a model with 4770 rows, 2070 columns and 16200 nonzeros
Presolve removed 810 rows and 0 columns
Presolve time: 0.11s
Presolved: 3960 rows, 2070 columns, 14220 nonzeros
Variable types: 0 continuous, 2070 integer (2070 binary)
Found heuristic solution: objective 27.0000000

Root relaxation: objective 3.000000e+00, 4286 iterations, 0.38 seconds

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

     0     0    3.00000    0   96   27.00000    3.00000  88.9%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  131    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   93    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0  111    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0  128    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  119    4.00000    3.00000  25.0%     -    4s
     0     2    3.00000    0  117    4.00000    3.00000  25.0%     -    5s
     6     6    3.00000    1  118    4.00000    3.00000  25.0%   319   10s
     9     8    3.00000    1  127    4.00000    3.00000  25.0%   212   15s
    21     8    3.00000   14   89    4.00000    3.00000  25.0%  2634   20s

Cutting planes:
  Gomory: 4
  Clique: 1
  Zero half: 1

Explored 30 nodes (95492 simplex iterations) in 20.31 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%