#include<stdio.h>
int main()
{
    int n;
    scanf("%d", &n);
    if (n<=0 || n< 10 || n%2==0)
    {
        printf ("Invalid input");
        return 0;
    }
    for (itn i=n; i>=1; i-=2)
    {
        for (int j =0; j<i; j++)
        {
            printf(" *");
        }
        printf ("\n");
    }
    return 0;
}