#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pii=pair<int,int>;

#define all(a) a.begin(),a.end()
#define pb push_back
#define sz(a) ((int)a.size())

signed main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    int n; string s,t; cin >> n >> s >> t;
    if((count(all(s),'1')+count(all(t),'1'))&1) reverse(all(t));
    int res=0;
    for(int i=0; i<n; ++i) if(s[i]!=t[i]) res++;
    cout << res << "\n";
}