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