package bishi;

import java.util.Scanner;

public class first {

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

int n=sc.nextInt();

for(int i=1;i<=n;i++){

for(int j=1;j<=i;j++){

System.out.print(j+" ");

}

for(int j=i-1;j>=1;j--){

System.out.print(j);

if(j!=1){

System.out.print(" ");

}

}

System.out.println();

}

}

}