import java.util.Scanner;
public final class Main{
  public static void main(String[] args){
  	Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    String str = sc.next();
    if(n%2 == 1)
      	System.out.println("No");
    else{
      	int half = n/2; 
    	if(str.substring(0,half).compareTo(str.substring(half)) == 0){
        	System.out.println("Yes");
        }else{
        	System.out.println("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