#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main () {
    int N;
    cin >> N;
    string s, t;
    cin >> s >> t;
    int ans1 = 0;
    for (int i = 0; i < N; i ++) {
        ans1 += s[i] != t[i];
    }
    int ans = 1e9  +7;
    if (ans1 % 2 == 0) {
        ans = ans1;
    }
    int ans2 = 0;
    for (int i = 0; i < N; i ++) {
        ans2 += s[N - i - 1] != t[i];
    }
    if (ans2 % 2 == 1) {
        ans = min(ans, ans2);
    }
    cout << ans << endl;
}