/* -*- coding: utf-8 -*-
 *
 * 2209.cc:  No.2209 Flip and Reverse - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 1000000;

/* typedef */

/* global variables */

char s[MAX_N + 4], t[MAX_N + 4];

/* subroutines */

int cntdiff(int n, char s[], char t[]) {
  int cnt = 0;
  for (int i = 0; i < n; i++)
    if (s[i] != t[i]) cnt++;
  return cnt;
}

/* main */

int main() {
  int n;
  scanf("%d%s%s", &n, s, t);

  int c0 = cntdiff(n, s, t);
  reverse(s, s + n);
  int c1 = cntdiff(n, s, t);

  printf("%d\n", (! (c0 & 1)) ? c0 : c1);
  return 0;
}