import java.util.Scanner;

public class StartWare0003 {

	public static void main(String[] args) {
		// Nama:Patimah Nim:D0217019 kelas:Informatikan.C
		Scanner a = new Scanner(System.in);
		System.out.println("INPUT: ");
		int bil = a.nextInt();
		System.out.println("OUTPUT: ");
		if (bil >= 1) {
			for (int i = 1; i <= bil; i++)
				System.out.print(i);
		}

		else {
			System.out.print("UNDEFINED");
		}

	}

}