java2522.java

import java.util.*;
public class java2522 {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        for(int i=0,k=n; i<2*n; i++) {

            for(int j=0; j<n; j++) {

                System.out.print(j<k-1?" ":"*");

            }

            if(i<n-1)

                k--;

            else

                k++;

            System.out.println();

        }
        sc.close();
    }
}