Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:59 2012

Optimize a model with 423 rows, 90 columns and 846 nonzeros
Presolve removed 147 rows and 0 columns
Presolve time: 0.00s
Presolved: 276 rows, 90 columns, 664 nonzeros
Variable types: 0 continuous, 90 integer (90 binary)
Found heuristic solution: objective 24.0000000

Root relaxation: objective 3.192308e+01, 170 iterations, 0.00 seconds

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

     0     0   31.92308    0   77   24.00000   31.92308  33.0%     -    0s
H    0     0                      26.0000000   31.92308  22.8%     -    0s
     0     0   31.21154    0   83   26.00000   31.21154  20.0%     -    0s
H    0     0                      27.0000000   31.21154  15.6%     -    0s
     0     0   30.81513    0   84   27.00000   30.81513  14.1%     -    0s
     0     0   30.65385    0   83   27.00000   30.65385  13.5%     -    0s
     0     0   30.47368    0   85   27.00000   30.47368  12.9%     -    0s
     0     0   30.47059    0   85   27.00000   30.47059  12.9%     -    0s
     0     0   30.47059    0   84   27.00000   30.47059  12.9%     -    0s
H    0     0                      28.0000000   30.47059  8.82%     -    0s
     0     2   30.47059    0   83   28.00000   30.47059  8.82%     -    0s

Cutting planes:
  Clique: 3
  Zero half: 33

Explored 64 nodes (1858 simplex iterations) in 0.08 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%