import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 入力値
		int n = sc.nextInt();
		String s = sc.next();
		// 文字列の長さ
		int len = n%2 == 0 ? n/2 : 0;
		// 2度繰り返せばOK
		boolean ret = false;
		if(len>0) {
			String c1 = s.substring(0,len);
			String c2 = s.substring(len,s.length());
			if (c1.equals(c2)) {
				ret = true;
			}
		}
		System.out.println(ret?"Yes":"No");
		sc.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