Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:04 2012

Optimize a model with 485 rows, 136 columns and 970 nonzeros
Presolve removed 128 rows and 7 columns
Presolve time: 0.00s
Presolved: 357 rows, 129 columns, 773 nonzeros
Variable types: 0 continuous, 129 integer (129 binary)
Found heuristic solution: objective 48.0000000

Root relaxation: objective 5.725000e+01, 234 iterations, 0.00 seconds

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

     0     0   57.25000    0  112   48.00000   57.25000  19.3%     -    0s
     0     0   56.28889    0  124   48.00000   56.28889  17.3%     -    0s
H    0     0                      49.0000000   56.28889  14.9%     -    0s
     0     0   55.35893    0  124   49.00000   55.35893  13.0%     -    0s
     0     0   54.64754    0  123   49.00000   54.64754  11.5%     -    0s
     0     0   54.32388    0  124   49.00000   54.32388  10.9%     -    0s
H    0     0                      50.0000000   54.32388  8.65%     -    0s
     0     0   53.89398    0  124   50.00000   53.89398  7.79%     -    0s
     0     0   53.79747    0  126   50.00000   53.79747  7.59%     -    0s
     0     0   53.75188    0  126   50.00000   53.75188  7.50%     -    0s
     0     0   53.63565    0  128   50.00000   53.63565  7.27%     -    0s
     0     0   53.56331    0  126   50.00000   53.56331  7.13%     -    0s
     0     0   53.54907    0  127   50.00000   53.54907  7.10%     -    0s
     0     0   53.54907    0  126   50.00000   53.54907  7.10%     -    0s
     0     2   53.54671    0  126   50.00000   53.54671  7.09%     -    0s
*   48     9               8      51.0000000   52.88235  3.69%  26.3    0s

Cutting planes:
  Clique: 1
  Zero half: 72

Explored 60 nodes (2255 simplex iterations) in 0.13 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%