Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:20:43 2012

Optimize a model with 3906 rows, 1806 columns and 13356 nonzeros
Presolve removed 966 rows and 0 columns
Presolve time: 0.08s
Presolved: 2940 rows, 1806 columns, 11172 nonzeros
Variable types: 0 continuous, 1806 integer (1806 binary)
Found heuristic solution: objective 26.0000000

Root relaxation: objective 3.000000e+00, 2630 iterations, 0.15 seconds

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

     0     0    3.00000    0   78   26.00000    3.00000  88.5%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0  138    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   41    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   91    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   58    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   74    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   74    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   74    4.00000    3.00000  25.0%     -    2s
     0     2    3.00000    0   74    4.00000    3.00000  25.0%     -    3s
     6     6    3.00000    1   36    4.00000    3.00000  25.0%   153    5s
    14    10    3.00000   13  193    4.00000    3.00000  25.0%  3111   12s

Cutting planes:
  Gomory: 2
  Zero half: 3

Explored 19 nodes (71996 simplex iterations) in 12.97 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%