#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define forn(i, a, n) for (int i = a; i < n; i++)
#define fornr(i, a, n) for (int i = n - 1; i >= a; i--)
#define print(a) cout << a << "\n";
#define printarr(a) forn(i, 0, a.size()) cout << a[i] << " "; cout << endl;
#define file_read(filepath) freopen(filepath, "r", stdin);
#define file_write(filepath) freopen(filepath, "w", stdout);
#define f first
#define s second
#define pb push_back
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define sorted(a) is_sorted(all(a))
#define vi vector<int>
#define vvi vector<vector<int>>
#define vc vector<char>
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define vpii vector<pair<int,int>>
#define MOD1 1000000007
#define mii map<int,int>
#define sz(a) (int)a.size()
#define ld long double
#define add insert

void solve(){
    int n;
    cin >> n;
    string s, t;
    cin >> s >> t;
    int cnt = 0;
    forn(i,0,n){
        cnt += (s[i] != t[i]);
    }
    cout << cnt << endl;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
}