#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;

int main(){
    int n; cin >> n;
    string s, t;
    cin >> s;
    cin >> t;

    int cnt1 = 0, cnt2 = 0;
    for(int i = 0; i < n; i++){
        if(s[i] != t[i]) cnt1++;
    }
    for(int i = 0; i < n; i++){
        if(s[i] != t[n-i-1]) cnt2++;
    }
    cout << min(cnt1+cnt1%2, cnt2+(1-cnt2%2)) << endl;
    return 0;
}