CatWatch

import java.util.Scanner;

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

        for (int i = 0; i < n - 2; i++) {
            String upperPart = repeatStr(" ", n)
                    + "||"
                    + repeatStr("_", n - 2)
                    + "||"
                    + repeatStr(" ", n);
            System.out.println(upperPart);
        }
        String firstMiddle = repeatStr(" ", n -1)
                + "//"
                + repeatStr(" ", n)
                + "\\\\"
                + repeatStr(" ", n -1);
        System.out.println(firstMiddle);
        for (int j = 0; j < n - 4; j++) {
            String secondMiddle = repeatStr(" ", n-2)
                    + "||"
                    + repeatStr(" ", n + 2)
                    + "||"
                    + repeatStr(" ", n-2);
            System.out.println(secondMiddle);
        }
        String thirdMiddle = repeatStr(" ", n -1)
                + "\\\\"
                + repeatStr(" ", n)
                + "//"
                + repeatStr(" ", n -1);
        System.out.println(thirdMiddle);
        for (int k = 0; k < n - 2; k++) {
            String downPart = repeatStr(" ", n)
                    + "||"
                    + repeatStr("_", n - 2)
                    + "||"
                    + repeatStr(" ", n);
            System.out.println(downPart);
        }
    }
    static String repeatStr (String text, int count){
                StringBuilder result = new StringBuilder();
                for (int i = 0; i < count; i++){
                    result.append(text);
                }
                return result.toString();
            }
}