#include<stdio.h>
int main()
{
    int n;
    scanf("%d" , &n);
    if(n < 0)
    {
        printf("Invalid Input\n");
        return 0;
    }
    if(n==0)
    {
        printf("1\n");
        return 0;
    }
    int size = 2 * n-1;
    for(int i =0; i < size; i++
    {
        for (int j =0; j<size; j++)
        
    }
    {
        int top=i;
        int left+j;
        int bottom = size-1-j;
        int right = size-1-j;
        int min = top;
        if(left<min)min = lefft;
        if(bottom<min)min = right;
        if(right<min)min = right;
        printf("%d",n min);
    }
    printf("\n");
    }
    return 0;
}