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