Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:24:01 2012

Optimize a model with 3947 rows, 1806 columns and 13438 nonzeros
Presolve removed 968 rows and 2 columns
Presolve time: 0.10s
Presolved: 3021 rows, 1804 columns, 12876 nonzeros
Variable types: 0 continuous, 1804 integer (1804 binary)
Found heuristic solution: objective 42.0000000

Root relaxation: objective 3.000000e+00, 2841 iterations, 0.21 seconds

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

     0     0    3.00000    0  234   42.00000    3.00000  92.9%     -    1s
H    0     0                       5.0000000    3.00000  40.0%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  484    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   45    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   79    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   81    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0  110    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   81    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  144    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  144    4.00000    3.00000  25.0%     -    5s
     0     2    3.00000    0  144    4.00000    3.00000  25.0%     -    6s
     6     6    3.00000    1   78    4.00000    3.00000  25.0%   212   10s

Cutting planes:
  Gomory: 10
  Zero half: 16

Explored 8 nodes (76386 simplex iterations) in 11.73 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%