Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:21:04 2012

Optimize a model with 5749 rows, 2550 columns and 19548 nonzeros
Presolve removed 1352 rows and 2 columns
Presolve time: 0.14s
Presolved: 4447 rows, 2548 columns, 18622 nonzeros
Variable types: 0 continuous, 2548 integer (2548 binary)
Found heuristic solution: objective 50.0000000

Root relaxation: objective 4.000000e+00, 4018 iterations, 0.38 seconds

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

     0     0    4.00000    0  165   50.00000    4.00000  92.0%     -    0s
H    0     0                      49.0000000    4.00000  91.8%     -    0s
H    0     0                      18.0000000    4.00000  77.8%     -    0s
*    0     0               0       4.0000000    4.00000   0.0%     -    1s

Cutting planes:
  Gomory: 2
  Zero half: 11

Explored 0 nodes (8574 simplex iterations) in 1.00 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%