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();

        if (n < 2 || n % 2 == 1) {
            System.out.println("No");
            return;
        }
        int size = n / 2;
        String sub = s.substring(0, size);
        StringBuilder sb = new StringBuilder();
        sb.append(sub).append(sb);
        if (sb.toString().equals(s)) {
            System.out.println("Yes");            
        } else {
            System.out.println("No");
        }
        
    }

}

/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