Gurobi 5.0.1 (linux64) logging started Sat Nov 17 19:52:04 2012

Optimize a model with 19 rows, 15 columns and 60 nonzeros
Presolve time: 0.00s
Presolved: 19 rows, 15 columns, 60 nonzeros
Variable types: 0 continuous, 15 integer (15 binary)
Found heuristic solution: objective 5.0000000

Root relaxation: objective 0.000000e+00, 8 iterations, 0.00 seconds

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

     0     0    0.00000    0    6    5.00000    0.00000   100%     -    0s
     0     0    0.83333    0    8    5.00000    0.83333  83.3%     -    0s
     0     0    1.00000    0    8    5.00000    1.00000  80.0%     -    0s
     0     0    1.00000    0    8    5.00000    1.00000  80.0%     -    0s
     0     0    1.00000    0    8    5.00000    1.00000  80.0%     -    0s
H    0     0                       4.0000000    1.00000  75.0%     -    0s
     0     2    1.00000    0    8    4.00000    1.00000  75.0%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 2

Explored 5 nodes (62 simplex iterations) in 0.00 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%