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();
		String ans = "No";
		if(n % 2 == 0) {
			if(s.substring(0,n/2).equals(s.substring(n/2))) {
				ans = "Yes";
			}
		}
		System.out.print(ans);

	}
}
/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