n = int(input())
s = input()
t = input()
u = 0
ans = 0
for i in range(n):
    u += int(s[i])
    u += int(t[i])
if u % 2:
    s = s[::-1]
for i in range(n):
    if s[i] != t[i]:
        ans += 1
print(ans)