#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    ll n;
    cin >> n;

    string s, t;
    cin >> s >> t;

    ll diff = 0;
    rep(i, n) diff += (s[i]!=t[i]);
    if(diff%2==0){
        cout << diff << endl;
        return 0;
    }

    string rev_s="";
    rep(i, n) rev_s+=s[n-1-i];

    ll diff2 = 0;
    rep(i, n) diff2+=(rev_s[i]!=t[i]);
    cout << diff2 << endl;
}