import sys
sys.set_int_max_str_digits(0)
input = sys.stdin.readline

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

# 偶数?
cnt = 0
for i in range(N):
    s, t = S[i], T[i]
    if s != t:
        cnt += 1

if cnt%2 == 0:
    exit(print(cnt))

S2 = S[::-1]
cnt = 0
for i in range(N):
    s, t = S2[i], T[i]
    if s != t:
        cnt += 1

print(cnt)