import java.util.*;

public class Main {

    public static void main(String[] args) {

        int k = 0;
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Ye Olde Keychain Shoppe");
        System.out.println();
        int choice = 0;
        int price = 10;
        while(choice != 4){
            System.out.println("1. Add Keychains to Order");
            System.out.println("2. Remove Keychains from Order");
            System.out.println("3. View Current Order");
            System.out.println("4. Checkout");
            System.out.println();
            System.out.println("Please enter your choice: ");
            choice = keyboard.nextInt();
            System.out.println();

            if (choice == 1){
                k = add_keychains(k);
                System.out.println();
            } else if (choice == 2){
                k = remove_keychains(k);
                System.out.println();
            } else if (choice == 3){
                view_order(k);
                System.out.println();
            } else if (choice == 4){
                Scanner s = new Scanner(System.in);
                System.out.println();
                System.out.println("CHECKOUT");
                System.out.println();
                System.out.println("What is your name? ");
                String name = s.next();
                view_order(k);
                System.out.println("Thanks for your order, " + name);
                break;
            }
        }

    }

    public static int add_keychains(int k){
        Scanner s = new Scanner(System.in);
        System.out.println("You have " + k + " keychains. How many to add? ");
        int add = s.nextInt();
        k = k + add;
        System.out.println("You now have " + k + " Keychains.");
        return(k);
    }

    public static int remove_keychains(int k){
        Scanner s = new Scanner(System.in);
        System.out.println("You now have " + k + " keychains. How many to remove? ");
        int remove = s.nextInt();
        int remain = k - remove;
        System.out.println("You now have " + remain + " Keychains. ");
        return remain;
    }

    public static int view_order(int k){
        System.out.println("You now have " + k + " Keychains.");
        System.out.println("Keychains cost $10 each.");
        int price = k*10;
        System.out.println("Total cost $ " + price + ".");
        return price;
    }

}