Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:24:44 2012

Optimize a model with 4031 rows, 1806 columns and 13690 nonzeros
Presolve removed 968 rows and 2 columns
Presolve time: 0.10s
Presolved: 3105 rows, 1804 columns, 13040 nonzeros
Variable types: 0 continuous, 1804 integer (1804 binary)
Found heuristic solution: objective 42.0000000

Root relaxation: objective 3.000000e+00, 2727 iterations, 0.22 seconds

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

     0     0    3.00000    0   82   42.00000    3.00000  92.9%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  381    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   77    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   76    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0  108    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   70    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   57    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   73    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   78    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   78    4.00000    3.00000  25.0%     -    6s
     0     2    3.00000    0   78    4.00000    3.00000  25.0%     -    7s
     5     5    3.00000    1   84    4.00000    3.00000  25.0%   448   10s

Cutting planes:
  Gomory: 16
  Zero half: 67

Explored 6 nodes (71486 simplex iterations) in 11.55 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%