Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:06:18 2012

Optimize a model with 519 rows, 182 columns and 1675 nonzeros
Presolve removed 262 rows and 2 columns
Presolve time: 0.01s
Presolved: 270 rows, 180 columns, 1284 nonzeros
Variable types: 0 continuous, 180 integer (180 binary)
Found heuristic solution: objective 13.0000000

Root relaxation: objective 4.000000e+00, 304 iterations, 0.00 seconds

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

     0     0    4.00000    0   33   13.00000    4.00000  69.2%     -    0s
H    0     0                       7.0000000    4.00000  42.9%     -    0s
H    0     0                       6.0000000    4.00000  33.3%     -    0s
     0     0    4.00000    0   58    6.00000    4.00000  33.3%     -    0s
H    0     0                       5.0000000    4.00000  20.0%     -    0s
H    0     0                       4.0000000    4.00000   0.0%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 1

Explored 0 nodes (687 simplex iterations) in 0.03 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%