import java.util.Scanner;

class Main {
    public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);

	int N = sc.nextInt();
	String S = sc.next();

	String T[] = S.split("");
	boolean bl = true;
	if (N % 2 == 1) {
	    bl = false;
	} else {
	    for (int i = 0; i < N / 2; i++) {
		if (!T[i].equals(T[N / 2 + i]))
		    bl = false;
	    }
	}

	if (bl)
	    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