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