#include <bits/stdc++.h>
using namespace std;
void a(string t){
  cout<<t<<endl;
  exit(0);
}
int main() {
  int n; string s; cin>>n>>s;
  if(n%2==1) a("No");
  for(int i=0;i<n/2;i++){
    if(s.at(i)!=s.at(i+n/2)) a("No");
  }
  a("Yes");
}
### Prompt

Develop a solution in CPP to the problem described below:

Given are a positive integer N and a string S of length N consisting of lowercase English letters.

Determine whether the string is a concatenation of two copies of some string. That is, determine whether there is a string T such that S = T + T.

Constraints

* 1 \leq N \leq 100
* S consists of lowercase English letters.
* |S| = N

Input

Input is given from Standard Input in the following format:


N
S


Output

If S is a concatenation of two copies of some string, print `Yes`; otherwise, print `No`.

Examples

Input

6
abcabc


Output

Yes


Input

6
abcadc


Output

No


Input

1
z


Output

No

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
void a(string t){
  cout<<t<<endl;
  exit(0);
}
int main() {
  int n; string s; cin>>n>>s;
  if(n%2==1) a("No");
  for(int i=0;i<n/2;i++){
    if(s.at(i)!=s.at(i+n/2)) a("No");
  }
  a("Yes");
}
```