import java.util.Scanner;
public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		String s = scan.next();
		boolean flg = true;

		for(int i=0;i<n;i++) {
			if(s.substring(0,n/2).equals(s.substring(n/2,n))) {
				flg = true;
			}else {
				flg = false;
			}
		}

		System.out.println(flg?"Yes":"No");
		scan.close();

	}

}

/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