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

ans = 10 ** 6
SS = S[::-1]

tmp = 0
for i in range(N):
    if S[i] != T[i]:
        tmp += 1
if tmp % 2 == 0:
    ans = tmp
tmp = 0
for i in range(N):
    if SS[i] != T[i]:
        tmp += 1
if tmp % 2 == 1 and tmp < ans:
    ans = tmp
print(tmp)