#include <bits/stdc++.h>
using namespace std;

int main() {
  int n;string s;cin>>n>>s;
  if(n%2){cout<<"No"<<endl;exit (0);}
  for(int i=0;i<n/2;i++){
    if(s.at(i)!=s.at(i+n/2)){cout<<"No"<<endl;exit (0);}
  }cout<<"Yes"<<endl;
}
