Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:15:50 2012

Optimize a model with 3719 rows, 1640 columns and 12598 nonzeros
Presolve removed 1162 rows and 2 columns
Presolve time: 0.10s
Presolved: 2557 rows, 1638 columns, 9910 nonzeros
Variable types: 0 continuous, 1638 integer (1638 binary)
Found heuristic solution: objective 40.0000000

Root relaxation: objective 4.000000e+00, 2060 iterations, 0.10 seconds

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

     0     0    4.00000    0   30   40.00000    4.00000  90.0%     -    0s
H    0     0                       5.0000000    4.00000  20.0%     -    0s
     0     0    4.00000    0   45    5.00000    4.00000  20.0%     -    0s
H    0     0                       4.0000000    4.00000   0.0%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 1

Explored 0 nodes (6150 simplex iterations) in 0.43 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%