import java.util.*;
public class Main {
	public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String  S= sc.next();
		String ans="Yes";
		if(N%2==1){
			ans="No";
			System.out.println(ans);
		}
		else{
			for(int i=0;i<=N/2-1;i++){
				if(S.charAt(i)!=S.charAt(i+(N/2))){
					ans="No";
				}
			}
		System.out.println(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