n = int(input())
s = input()
t = input()
c0 = sum(c0 != c1 for c0, c1 in zip(s, t))
c1 = sum(c0 != c1 for c0, c1 in zip(reversed(s), t))
ans = c0 if c0 % 2 == 0 else c1
print(ans)