Return sum of three values, excluding values within a specified range

Is there a way to make my code simpler?


Given three 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 three 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):
    if fix_teen(a) == 0 and fix_teen(b) == 0 and fix_teen(c) == 0:
        return 0        
    elif fix_teen(a) != 0 and fix_teen(b) != 0 and fix_teen(c) != 0:
        return a + b + c
    elif (fix_teen(a) and fix_teen(b)) != 0:
        return a + b
    elif (fix_teen(b) and fix_teen(c)) != 0:
        return b + c
    elif (fix_teen(a) and fix_teen(c)) != 0:
        return a + c
    elif fix_teen(a) != 0:
        return a
    elif fix_teen(b) != 0:
        return b
    elif fix_teen(c) != 0:
        return c

def fix_teen(n):
    if n in [13, 14, 17, 18, 19]:
        return 0
    else:
        return n

I may be off the mark here as I didn't test my code (no access to a Python environment), but this is the way I'd 'start' to work at it.

def no_teen_sum(a, b, c):
    return fix_teen(a) + fix_teen(b) + fix_teen(c)

def fix_teen(n):
    if n in [13, 14, 17, 18, 19]:
        return 0
    else:
        return n

Quite simple.

StackExchange Code Review Q#97920, answer score: 12