Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:45 2012

Optimize a model with 254 rows, 73 columns and 508 nonzeros
Presolve removed 67 rows and 0 columns
Presolve time: 0.00s
Presolved: 187 rows, 73 columns, 419 nonzeros
Variable types: 0 continuous, 73 integer (73 binary)
Found heuristic solution: objective 21.0000000

Root relaxation: objective 3.000000e+01, 111 iterations, 0.00 seconds

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

     0     0   30.00000    0   50   21.00000   30.00000  42.9%     -    0s
H    0     0                      25.0000000   30.00000  20.0%     -    0s
     0     0   29.50000    0   68   25.00000   29.50000  18.0%     -    0s
     0     0   29.22535    0   70   25.00000   29.22535  16.9%     -    0s
     0     0   29.00000    0   69   25.00000   29.00000  16.0%     -    0s
H    0     0                      26.0000000   29.00000  11.5%     -    0s
H    0     0                      28.0000000   29.00000  3.57%     -    0s
     0     0   29.00000    0   61   28.00000   29.00000  3.57%     -    0s
     0     0     cutoff    0        28.00000   28.99997  3.57%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 85

Explored 0 nodes (308 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%