#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
void solve(){
    int n;
    cin>>n;
    string s,t;
    cin>>s>>t;
    int cnt1 = 0;
    int cnt2 = 0;
    for(int i=0;i<n;i++){
        cnt1 += s[i] != t[i];
        cnt2 += s[n-i-1] != t[i];
    }
    int ans = 1e9;
    if(cnt1 % 2 == 0) ans = min(ans , cnt1);
    if(cnt2 & 1) ans = min(ans , cnt2);
    cout<<ans<<endl;
    
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);
    int t=1;
    //cin>>t;
    while(t--){
        solve();
    }
    return 0;
}