import java.util.*;
import java.io.*;

class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        char[] c=sc.next().toCharArray();
        sc.close();
        int l=c.length;
        if(l%2!=0){
            System.out.println("No");
            return;
        }
        for(int i=0;i<l/2;i++){
            if(c[i]!=c[i+l/2]){
                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