n = int(input())
s = list(input())
t = list(input())

if s.count("1")%2 == t.count("1")%2:
    ans = 0
    for i in range(n):
        if s[i] != t[i]:
            ans += 1
    print(ans)
else:
    ans = 0
    for i in range(n):
        if s[i] != t[n-i-1]:
            ans += 1
    print(ans)