import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int len = sc.nextInt();
    String s = sc.next();
    if (len % 2 != 0) {
      System.out.println("No");
      return;
    }
    for (int i = 0, j = len/2; j < len; i++, j++) {
      if (s.charAt(i) != s.charAt(j)) {
        System.out.println("No");
        return;
      }
    }
    System.out.println("Yes");
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz