#include<stdio.h>
int main()
{
    int n;
    scanf ("%d",&n);
    if(n % 2 == 0){
        printf ("invalid input");
        return 0;
        
    } 
    int spaces =0;
    for(int star =n; star > 0;stars =2){
        for (int s=0; s <  spaces;s++ ){
            printf (" ");
        }
        for (int st = 0; st < stars; st++){
            printf("*");
            }
            printf ("\n");
            spaces++;
    }
    return 0;
}