Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:18:02 2012

Optimize a model with 3690 rows, 1722 columns and 12628 nonzeros
Presolve removed 943 rows and 0 columns
Presolve time: 0.07s
Presolved: 2747 rows, 1722 columns, 10332 nonzeros
Variable types: 0 continuous, 1722 integer (1722 binary)
Found heuristic solution: objective 23.0000000

Root relaxation: objective 3.000000e+00, 2607 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   62   23.00000    3.00000  87.0%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0  105    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0  114    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   97    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   42    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   63    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   40    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  106    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  114    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   42    4.00000    3.00000  25.0%     -    5s
     0     2    3.00000    0   42    4.00000    3.00000  25.0%     -    6s
     7     6    3.00000    1   57    4.00000    3.00000  25.0%   377   10s
    12    10    3.00000    1   48    4.00000    3.00000  25.0%   220   15s

Cutting planes:
  Gomory: 2
  Zero half: 8

Explored 21 nodes (134478 simplex iterations) in 19.29 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%