#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 s = 0; s < spaces; s++) {
            printf (" ");
        }
        for (int j = 0; j < i; j++) {
            printf("*");
        }
        printf("\n");
        return 0;
        
    }