#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;cin>>n;
    string a;cin>>a;
    string t;cin>>t;
   // bool flag=false;
    int d=0;
    while(1)
    {
        string c;
        c.assign(a,0,n);
        if(c==t)break;
        d++;
        reverse(a.begin(),a.end());
        a+=c[last_ind];
        reverse(a.begin(),a.end());
        //cx;
    }
    cout<<d<<endl;
}