#include<bits/stdc++.h>
using namespace std;
int main(){
  int n; cin >> n;
  string s; cin >> s;
  if(n % 2)return puts("No") *0;
  for(int i = 0; i < n/2; ++i){
    if(s[i] != s[n/2 + i]) return puts("No") *0;
  }
  puts("Yes") ;
}
