def F( n : int) -> int:
  return 1 if n == 20 else \
         0 if n > 20 else \
         F(n+1) + F(2*n)
         
graph = { 'A': {'C': 3, 'D': 1},
          'B': {'C': 4, 'D': 5, 'E': 1},
          'C': {'A': 3, 'B': 4, 'E': 2},
          'D': {'A': 1, 'B': 5, 'E': 1},
          'E': {'B': 1, 'C': 2, 'D': 1} }

print(graph,type(graph),sep = "\n")      

#d = float(1)
#e = int('e')