04.Balls

import java.util.Scanner;

public class Beer {
    public static void main(String[] agrs) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());

        String firstRow = repeatStr(" ", n / 2)
                + repeatStr("*", n + 1);
        System.out.println(firstRow);

        for (int i = 0; i < n / 2; i++) {
            String middlePart1 = repeatStr(" ", n / 2)
                    + "*"
                    + repeatStr(" ", n - 1)
                    + "*";
            System.out.println(middlePart1);
        }
        for (int i = 0; i < n / 2; i++) {
            String middlePart2 = repeatStr(" ",n / 2 - i)
                    + "*"
                    + repeatStr(" ", n - 1 + 2 * i)
                    + "*"
                    + repeatStr(" ",n / 2 - i);
            System.out.println(middlePart2);

        }
        for (int i = 0; i < n ; i++) {
            String bottom1 = "*"
                    + repeatStr(".", 2 * n - 2)
                    + "*";
            System.out.println(bottom1);

        }
        for (int i = 0; i < n ; i++) {
            String bottom2 = "*"
                    + repeatStr("@", 2 * n - 2)
                    + "*";
            System.out.println(bottom2);

        }
        System.out.println(repeatStr("*", 2 * n));

    }

    static String repeatStr(String text, int count) {
        StringBuilder result = new StringBuilder();

        for (int i = 0; i < count; i++) {
            result.append(text);

        }
        return result.toString();
    }
}