#include <bits/stdc++.h>

using namespace std;

int main()
{int n;
 string s;
 cin >> n >> s;

 if (n%2==1){ cout << "No"; return 0;}
 for (int i=0; i<n/2; ++i)
   if (s[i]!=s[i+n/2]){ cout << "No"; return 0;}

  cout << "Yes";


 }
