"""Given 3 int values, a b c, return their sum. However, if any of the values
  is a teen -- in the range 13..19 inclusive -- then that value counts as 0,
  except 15 and 16 do not count as a teens. Write a separate helper
  "def fix_teen(n):"that takes in an int value and returns that value fixed for
  the teen rule. In this way, you avoid repeating the teen code
  3 times (i.e. "decomposition"). Define the helper below and at the same
  indent level as the main no_teen_sum().


no_teen_sum(1, 2, 3) → 6
no_teen_sum(2, 13, 1) → 3
no_teen_sum(2, 1, 14) → 3"""
def no_teen_sum(a, b, c):
  numbers = [a, b, c]
  total = 0
  for n in numbers:
    if not fix_teen(n):
      total += 0
    else:
      total += n
  return total

def fix_teen(n):
  return (n in (13,14,17,18,19))
