Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:44 2012

Optimize a model with 471 rows, 132 columns and 942 nonzeros
Presolve removed 117 rows and 5 columns
Presolve time: 0.00s
Presolved: 354 rows, 127 columns, 772 nonzeros
Variable types: 0 continuous, 127 integer (127 binary)
Found heuristic solution: objective 41.0000000

Root relaxation: objective 5.450000e+01, 218 iterations, 0.00 seconds

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

     0     0   54.50000    0  107   41.00000   54.50000  32.9%     -    0s
     0     0   53.62500    0  113   41.00000   53.62500  30.8%     -    0s
H    0     0                      44.0000000   53.62500  21.9%     -    0s
     0     0   52.66667    0  116   44.00000   52.66667  19.7%     -    0s
     0     0   52.30357    0  123   44.00000   52.30357  18.9%     -    0s
     0     0   52.05914    0  127   44.00000   52.05914  18.3%     -    0s
     0     0   51.91184    0  126   44.00000   51.91184  18.0%     -    0s
H    0     0                      47.0000000   51.91184  10.5%     -    0s
     0     0   51.77178    0  126   47.00000   51.77178  10.2%     -    0s
     0     0   51.56648    0  126   47.00000   51.56648  9.72%     -    0s
     0     0   51.44594    0  124   47.00000   51.44594  9.46%     -    0s
     0     0   51.40802    0  125   47.00000   51.40802  9.38%     -    0s
     0     0   51.40802    0  125   47.00000   51.40802  9.38%     -    0s
     0     2   51.40707    0  125   47.00000   51.40707  9.38%     -    0s

Cutting planes:
  Gomory: 3
  Clique: 1
  Zero half: 87

Explored 309 nodes (8450 simplex iterations) in 0.31 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%