Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:20 2012

Optimize a model with 457 rows, 139 columns and 914 nonzeros
Presolve removed 87 rows and 0 columns
Presolve time: 0.00s
Presolved: 370 rows, 139 columns, 791 nonzeros
Variable types: 0 continuous, 139 integer (139 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 5.900000e+01, 235 iterations, 0.00 seconds

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

     0     0   59.00000    0  112   46.00000   59.00000  28.3%     -    0s
     0     0   57.66667    0  127   46.00000   57.66667  25.4%     -    0s
     0     0   57.07234    0  130   46.00000   57.07234  24.1%     -    0s
H    0     0                      48.0000000   57.07234  18.9%     -    0s
     0     0   56.66667    0  131   48.00000   56.66667  18.1%     -    0s
H    0     0                      50.0000000   56.66667  13.3%     -    0s
     0     0   56.45924    0  132   50.00000   56.45924  12.9%     -    0s
     0     0   55.97117    0  131   50.00000   55.97117  11.9%     -    0s
     0     0   55.89042    0  133   50.00000   55.89042  11.8%     -    0s
H    0     0                      51.0000000   55.89042  9.59%     -    0s
     0     0   55.67178    0  133   51.00000   55.67178  9.16%     -    0s
     0     0   55.59609    0  136   51.00000   55.59609  9.01%     -    0s
     0     0   55.56074    0  136   51.00000   55.56074  8.94%     -    0s
     0     0   55.56074    0  135   51.00000   55.56074  8.94%     -    0s
H    0     0                      52.0000000   55.56074  6.85%     -    0s
     0     2   55.55893    0  135   52.00000   55.55893  6.84%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 105

Explored 126 nodes (5015 simplex iterations) in 0.21 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%