#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;


int main(){
    int N; cin >> N;
    string S, T; cin >> S >> T;
    int cnt = 0;
    rep(i,N) if(S[i] != T[i]) cnt++;
    if(cnt % 2 == 1){ reverse(S.begin(), S.end()); }
    cnt = 0;
    rep(i,N) if(S[i] != T[i]) cnt++;
    cout << cnt << endl;
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;