Parallelepiped - Drawing with Loops / Java Basics

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

        Scanner input = new Scanner(System.in);

        int n = Integer.parseInt(input.nextLine());

        System.out.println("+" + repeatString("~", n - 2) + "+" + repeatString(".", n * 2 + 1));
        for (int i = 0; i < n * 2 + 1; i++) {
            System.out.println("|" + repeatString(".", i) + "\\" + repeatString("~", n - 2) + "\\" + repeatString(".", (n * 2) - i));
        }
        for (int i = 0; i < n * 2 + 1; i++) {
            System.out.println(repeatString(".", i) + "\\" + repeatString(".",(n * 2) - i) + "|" + repeatString("~", n - 2) + "|");
        }
        System.out.println(repeatString(".", n * 2 + 1) + "+" + repeatString("~", n - 2) + "+");



    }
    public static String repeatString(String str, int counter) {
        String text = "";
        for (int i = 0; i < counter; i++) {
            text += str;
        }
        return text;
    }
}