Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:56:15 2012

Optimize a model with 5921 rows, 2256 columns and 19785 nonzeros
Presolve removed 2023 rows and 2 columns
Presolve time: 0.12s
Presolved: 3945 rows, 2254 columns, 17128 nonzeros
Variable types: 0 continuous, 2254 integer (2254 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 4.000000e+00, 3141 iterations, 0.27 seconds

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

     0     0    4.00000    0   70   47.00000    4.00000  91.5%     -    1s
H    0     0                      44.0000000    4.00000  90.9%     -    1s
H    0     0                       8.0000000    4.00000  50.0%     -    1s
*    0     0               0       4.0000000    4.00000   0.0%     -    1s

Cutting planes:
  Gomory: 2
  Zero half: 4

Explored 0 nodes (13233 simplex iterations) in 1.16 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%