Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:06:25 2012

Optimize a model with 927 rows, 272 columns and 2974 nonzeros
Presolve removed 482 rows and 2 columns
Presolve time: 0.01s
Presolved: 461 rows, 270 columns, 2262 nonzeros
Variable types: 0 continuous, 270 integer (270 binary)
Found heuristic solution: objective 15.0000000

Root relaxation: objective 4.000000e+00, 422 iterations, 0.01 seconds

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

     0     0    4.00000    0   18   15.00000    4.00000  73.3%     -    0s
H    0     0                      10.0000000    4.00000  60.0%     -    0s
H    0     0                       5.0000000    4.00000  20.0%     -    0s
*    0     0               0       4.0000000    4.00000   0.0%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 6

Explored 0 nodes (1351 simplex iterations) in 0.06 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%