import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String scan_N = scan.next();
        String str = scan.next();
		scan.close();
        int N = Integer.parseInt(scan_N);
        if (str.substring(0,N/2).equals(str.substring(N/2,N))) {
          System.out.println("Yes");
        } else {
          System.out.println("No");
        }
      
    }
}

/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