Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:41:48 2012

Optimize a model with 4994 rows, 2070 columns and 16828 nonzeros
Presolve removed 1442 rows and 2 columns
Presolve time: 0.12s
Presolved: 3597 rows, 2068 columns, 15275 nonzeros
Variable types: 0 continuous, 2068 integer (2068 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 3.000000e+00, 3329 iterations, 0.31 seconds

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

     0     0    3.00000    0  282   45.00000    3.00000  93.3%     -    1s
H    0     0                      18.0000000    3.00000  83.3%     -    1s
H    0     0                      10.0000000    3.00000  70.0%     -    1s
     0     0    3.00000    0  531   10.00000    3.00000  70.0%     -    1s
H    0     0                       9.0000000    3.00000  66.7%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    2s
     0     0    3.00000    0   66    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   71    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   85    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  104    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0  104    4.00000    3.00000  25.0%     -    6s
     0     2    3.00000    0  104    4.00000    3.00000  25.0%     -    7s
     4     4    3.00000    1   89    4.00000    3.00000  25.0%   336   10s
     8     7    3.00000    1   66    4.00000    3.00000  25.0%   168   15s
    12    11    3.00000   13   58    4.00000    3.00000  25.0%  4219   20s

Cutting planes:
  Gomory: 2
  Zero half: 13

Explored 15 nodes (89787 simplex iterations) in 20.72 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%