import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int len = Integer.parseInt(sc.next());
        char[] s = sc.next().toCharArray();
        
        sc.close();
        if(len%2!=0){
            System.out.println("No");
            return;
        }else{
            int half = len/2;
            for(int i=0;i+half<len;i++){
                if(s[i]!=s[i+half]){
                    System.out.println("No");
                    return;
                }
            }
        }
        System.out.println("Yes");
    }
}
/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