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

S_rev = S[::-1]

c1 = sum(S[i] != T[i] for i in range(N))
c2 = sum(S_rev[i] != T[i] for i in range(N))

if c1 % 2 == 0:
    print(c1)
else:
    print(c2)