import sys
input = sys.stdin.readline

N = int(input())
S = input().rstrip()
T = input().rstrip()
even = sum(S[i] != T[i] for i in range(N))
odd = sum(S[N-1-i] != T[i] for i in range(N))
ans = 10**18
if even % 2 == 0:
    ans = even
if odd % 2 == 1:
    ans = min(ans, odd)
print(ans)