package com.company;

import java.util.Scanner;

public class Main {

    public static final String INPUT_MESSAGE = "enter w:";
    public static final String FIRST_ERROR_MESSAGE = "input error";

    public static int getInt(Scanner scanner){
        while(true){
            while(!scanner.hasNextInt()){
                System.out.println(FIRST_ERROR_MESSAGE);
                scanner.next();
            }
            int a = scanner.nextInt();

            if(a>=3 && a%2 == 1){
                return a;
            }
            else{
                System.out.println(FIRST_ERROR_MESSAGE);
            }
        }
    }


    public static void draw(int w){
        //печатаем 1 строку
        for(int i = 0; i < w; i++){
            System.out.print("*");
        }
        System.out.println();

        for (int i = w/2; i >= 1; i--){

            for(int j = 0; j < i; j++){
                System.out.print("*");
            }

            for(int j = 0; j < w-2*i; j++){
                System.out.print(" ");
            }

            for(int j = 0; j < i; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println(INPUT_MESSAGE);
        int w = getInt(scanner);

        draw(w);
    }
}