#include<stdio.h>
int main()
{
    int a,i,j;
    scanf("%d",&a);
    if (a%2==0)
    {
        printf("Invalid Input");
    }
    for (i=a;i>0;i-=2)
    {
        for (j=0;j<(a-i)/2;j++)
        printf(" ");
        for (j=0;j<i;j++)
        printf("\n");
    }