// Arup Guha
// 10/7/2017
// Solution to Junior Knights Free Response Question #1 (from Loop Practice)

import java.util.*;

public class numtriangle {


	public static void main(String[] args) {

		Scanner stdin = new Scanner(System.in);
		System.out.println("Enter n.");
		int n = stdin.nextInt();

		// Label rows from n down to 1.
		for (int i=n; i>=1; i--) {

			// Print 1, 2, 3, ..., i
			for (int j=1; j<=i; j++)
				System.out.print(j+" ");

			System.out.println();
		}


		// I will count my rows from 0 to n-1.
		for (int i=0; i<n; i++) {

			for (int j=1; j<=n-i; j++)
				System.out.print(j+" ");
			System.out.println();
		}
	}
}