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

cnts = cntt = 0
for c in S:
    if c == "1":
        cnts += 1
for c in T:
    if c == "1":
        cntt += 1
if abs(cnts - cntt) % 2 == 1:
    S.reverse()

ans = 0
for i in range(N):
    if S[i] != T[i]:
        ans += 1
print(ans)