def no_teen_sum(a, b, c):
  return fix_teen(a) + fix_teen(b) + fix_teen(c)
def fix_teen(n):
  if n < 15 and n > 12:
    return 0
  elif n == 15 or n == 16:
    return n
  elif n > 16 and n < 20:
    return 0
  else:
    return n
