#include <bits/stdc++.h>
using namespace std;
int main() {
    int N,a=0,an=0;
    string S,T;
    cin>>N>>S>>T;
    for(int i=0;i<N;i++)a+=S[i]-'0'*2+T[i];
    if(a%2==1)reverse(S.begin(),S.end());
    for(int i=0;i<N;i++)an+=(S[i]!=T[i]);
    cout<<an<<endl;
}