#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    string s, t;
    cin >> n >> s >> t;
    int ans = 0;
    for(int i = 0; i < n; i++)ans += (s[i] != t[i]);
    if(ans & 1){
        ans = 0;
        reverse(s.begin(), s.end());
        for(int i = 0; i < n; i++)ans += (s[i] != t[i]);
    }
    cout << ans << '\n';
}