import java.util.*;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    String S = sc.next();
    boolean answer = false;
    if(N%2==0){
      for(int i = 0;i<N/2;i++){
        if(S.charAt(i)==S.charAt(i+N/2)){
          if(i==N/2-1){
            answer = true;
          }
        }else{
          break;
        }
      }
    }
    if(answer){
      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