Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:46 2012

Optimize a model with 278 rows, 76 columns and 556 nonzeros
Presolve removed 91 rows and 1 columns
Presolve time: 0.00s
Presolved: 187 rows, 75 columns, 451 nonzeros
Variable types: 0 continuous, 75 integer (75 binary)
Found heuristic solution: objective 25.0000000

Root relaxation: objective 3.000000e+01, 132 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   25.00000   30.00000  20.0%     -    0s
H    0     0                      26.0000000   30.00000  15.4%     -    0s
     0     0   29.85280    0   75   26.00000   29.85280  14.8%     -    0s
     0     0   29.37500    0   71   26.00000   29.37500  13.0%     -    0s
H    0     0                      27.0000000   29.37500  8.80%     -    0s
     0     0   29.08696    0   65   27.00000   29.08696  7.73%     -    0s
     0     0   29.05882    0   72   27.00000   29.05882  7.63%     -    0s
     0     0   29.01811    0   73   27.00000   29.01811  7.47%     -    0s
H    0     0                      28.0000000   29.01811  3.64%     -    0s
     0     0     cutoff    0        28.00000   28.99997  3.57%     -    0s

Cutting planes:
  Zero half: 41

Explored 0 nodes (334 simplex iterations) in 0.03 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%