N = int(input())
S = str(input())
T = str(input())

parity_s = 0
parity_t = 0
for i in range(N):
    if S[i] == '1':
        parity_s += 1
    if T[i] == '1':
        parity_t += 1

ans = 0
if parity_s % 2 != parity_t % 2:
    for i in range(N):
        if S[i] != T[N - 1 - i]:
            ans += 1
else:
    for i in range(N):
        if S[i] != T[i]:
            ans += 1

print(ans)