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
import java.util.*;

public class Main {
  public static void main(String args[]) {
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    String S = sc.next();
    
    if (N % 2 == 0) {
	  if (S.substring(0, N / 2).equals(S.substring(N / 2, N))) {
        System.out.println("Yes");
        return;
      }
    }
    System.out.println("No");
  }
}