Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:58 2012

Optimize a model with 430 rows, 89 columns and 860 nonzeros
Presolve removed 161 rows and 0 columns
Presolve time: 0.00s
Presolved: 269 rows, 89 columns, 665 nonzeros
Variable types: 0 continuous, 89 integer (89 binary)
Found heuristic solution: objective 25.0000000

Root relaxation: objective 3.188158e+01, 175 iterations, 0.00 seconds

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

     0     0   31.88158    0   84   25.00000   31.88158  27.5%     -    0s
     0     0   31.36044    0   87   25.00000   31.36044  25.4%     -    0s
H    0     0                      26.0000000   31.36044  20.6%     -    0s
H    0     0                      27.0000000   31.36044  16.1%     -    0s
     0     0   31.17746    0   85   27.00000   31.17746  15.5%     -    0s
     0     0   31.00000    0   83   27.00000   31.00000  14.8%     -    0s
     0     0   30.94256    0   88   27.00000   30.94256  14.6%     -    0s
     0     0   30.90640    0   85   27.00000   30.90640  14.5%     -    0s
     0     0   30.87726    0   87   27.00000   30.87726  14.4%     -    0s
H    0     0                      28.0000000   30.87726  10.3%     -    0s
     0     0   30.83852    0   88   28.00000   30.83852  10.1%     -    0s
     0     0   30.83314    0   87   28.00000   30.83314  10.1%     -    0s
     0     0   30.83300    0   87   28.00000   30.83300  10.1%     -    0s
     0     0   30.83300    0   87   28.00000   30.83300  10.1%     -    0s
     0     2   30.83248    0   87   28.00000   30.83248  10.1%     -    0s

Cutting planes:
  Gomory: 1
  Clique: 1
  Zero half: 31

Explored 48 nodes (1667 simplex iterations) in 0.11 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%