import java.util.Scanner;

public class Mountain {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		mountain(N);
	}
	public static void mountain(int n) {
		if(n==1) {
			System.out.print("1");
		} else {
			mountain(n-1);
			System.out.print(n);
			mountain(n-1);
		}
	}
}