Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:56:13 2012

Optimize a model with 5545 rows, 2256 columns and 18657 nonzeros
Presolve removed 1694 rows and 2 columns
Presolve time: 0.11s
Presolved: 3898 rows, 2254 columns, 16801 nonzeros
Variable types: 0 continuous, 2254 integer (2254 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 4.000000e+00, 3339 iterations, 0.26 seconds

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

     0     0    4.00000    0  252   47.00000    4.00000  91.5%     -    0s
H    0     0                      25.0000000    4.00000  84.0%     -    0s
H    0     0                      13.0000000    4.00000  69.2%     -    0s
*    0     0               0       4.0000000    4.00000   0.0%     -    1s

Cutting planes:
  Gomory: 3
  Zero half: 16

Explored 0 nodes (9297 simplex iterations) in 1.07 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%