Butterfly

import java.util.Scanner;

public class butfly {

    static String repeatStr(String strToRepeat, int count) {
        String text = "";
        for (int i = 0; i < count; i++) {
            text += strToRepeat;
        }
        return text;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine());
        int halfRowSize = n - 2;

        for (int i = 1; i <= halfRowSize; i++) {
            if (i % 2 != 0) {
                System.out.println(String.format("%s\\ /%s", repeatStr("*", halfRowSize), repeatStr("*", halfRowSize)));
            } else {
                System.out.println(String.format("%s\\ /%s", repeatStr("-", halfRowSize), repeatStr("-", halfRowSize)));
            }
        }
        System.out.println(String.format("%s @ %s", repeatStr(" ", halfRowSize), repeatStr(" ", halfRowSize)));

        for (int i = 1; i <= halfRowSize; i++) {
            if (i % 2 != 0) {
                System.out.println(String.format("%s/ \\%s", repeatStr("*", halfRowSize), repeatStr("*", halfRowSize)));
            } else {
                System.out.println(String.format("%s/ \\%s", repeatStr("-", halfRowSize), repeatStr("-", halfRowSize)));
            }
        }
    }

}