#Given 3 int values, a b c, return their sum. However, if one of the values is the same as another of the values, it does not count towards the sum.

#lone_sum(1, 2, 3) → 6
#lone_sum(3, 2, 3) → 2
#lone_sum(3, 3, 3) → 0

def lone_sum(a,b,c):
    if a==c ==b: return 0
    elif a ==b: return c
    elif b==c: return a
    elif a == c: return b
    else: return a+b+c
#Given 3 int values, a b c, return their sum. However, if one of the values is the same as another of the values, it does not count towards the sum.

#lone_sum(1, 2, 3) → 6
#lone_sum(3, 2, 3) → 2
#lone_sum(3, 3, 3) → 0

def lone_sum(a,b,c):
    if a==c ==b: return 0
    elif a ==b: return c
    elif b==c: return a
    elif a == c: return b
    else: return a+b+c
#Given 3 int values, a b c, return their sum. However, if one of the values is the same as another of the values, it does not count towards the sum. #lone_sum(1, 2, 3) → 6 #lone_sum(3, 2, 3) → 2 #lone_sum(3, 3, 3) → 0