import sys
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

n = ni()
s = input()
t = input()
a = 0
b = 0
for i in range(n):
    if s[i] != t[i]:
        a += 1
for i in range(n):
    if s[-1-i] != t[i]:
        b += 1
if a % 2 == 0:
    print(a)
else:
    print(b)