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

Optimize a model with 397 rows, 126 columns and 794 nonzeros
Presolve removed 76 rows and 4 columns
Presolve time: 0.00s
Presolved: 321 rows, 122 columns, 681 nonzeros
Variable types: 0 continuous, 122 integer (122 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 5.550000e+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   55.50000    0  107   47.00000   55.50000  18.1%     -    0s
     0     0   54.50000    0  115   47.00000   54.50000  16.0%     -    0s
H    0     0                      50.0000000   54.50000  9.00%     -    0s
     0     0   53.76074    0  120   50.00000   53.76074  7.52%     -    0s
H    0     0                      51.0000000   53.76074  5.41%     -    0s
     0     0   53.16279    0  119   51.00000   53.16279  4.24%     -    0s
     0     0   52.77650    0  120   51.00000   52.77650  3.48%     -    0s
     0     0   52.39362    0  117   51.00000   52.39362  2.73%     -    0s
     0     0   52.18182    0  117   51.00000   52.18182  2.32%     -    0s
     0     0   52.04310    0  116   51.00000   52.04310  2.05%     -    0s
     0     0     cutoff    0        51.00000   51.99995  1.96%     -    0s

Cutting planes:
  Zero half: 64

Explored 0 nodes (717 simplex iterations) in 0.05 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%