Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:53 2012

Optimize a model with 486 rows, 134 columns and 972 nonzeros
Presolve removed 111 rows and 5 columns
Presolve time: 0.00s
Presolved: 375 rows, 129 columns, 806 nonzeros
Variable types: 0 continuous, 129 integer (129 binary)
Found heuristic solution: objective 44.0000000

Root relaxation: objective 5.600000e+01, 232 iterations, 0.00 seconds

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

     0     0   56.00000    0  104   44.00000   56.00000  27.3%     -    0s
     0     0   55.65000    0  124   44.00000   55.65000  26.5%     -    0s
H    0     0                      49.0000000   55.65000  13.6%     -    0s
     0     0   54.77098    0  123   49.00000   54.77098  11.8%     -    0s
     0     0   54.40000    0  123   49.00000   54.40000  11.0%     -    0s
     0     0   54.18065    0  125   49.00000   54.18065  10.6%     -    0s
     0     0   53.56349    0  125   49.00000   53.56349  9.31%     -    0s
     0     0   53.44720    0  127   49.00000   53.44720  9.08%     -    0s
     0     0   53.34112    0  124   49.00000   53.34112  8.86%     -    0s
     0     0   53.26685    0  123   49.00000   53.26685  8.71%     -    0s
     0     0   53.17955    0  125   49.00000   53.17955  8.53%     -    0s
     0     0   53.12940    0  126   49.00000   53.12940  8.43%     -    0s
     0     0   53.11474    0  129   49.00000   53.11474  8.40%     -    0s
     0     0   53.11474    0  122   49.00000   53.11474  8.40%     -    0s
     0     2   53.11434    0  122   49.00000   53.11434  8.40%     -    0s

Cutting planes:
  Zero half: 117

Explored 149 nodes (5860 simplex iterations) in 0.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.900000000000e+01, best bound 4.900000000000e+01, gap 0.0%