import sys
input = sys.stdin.buffer.readline
n = int(input())
s = input()
t = input()
d = sum([s[i] != t[i] for i in range(n)])
if d % 2 == 0:
    print(d)
else:
    t = list(reversed(t))
    print(sum([s[i] != t[i] for i in range(n)]))