import java.util.Scanner;

public class Teachers_Correction {

	public static void main(String [] args) {
		int balance = 0;
		Scanner sc = new Scanner (System.in);

		// show main menu

		System.out.println(" Welcome to Cafe Java! \n \n Main Menu \n 1. Food Menu \n 2. Drink Menu \n 3. Balance \n 4. Exist ");
		System.out.println(" \n Enter the number:");
		int	option = sc.nextInt();
		int burger = 0;
		int sandwich = 0;
		int coffee = 0;
		int tea = 0;



		while (option > 0 && option <4) {
			switch (option) {
			case 1:
				// show food menu
				System.out.println(" Food Menu \n \n 1. Burger (MMK 2500) \n 2. Sandwich (MMK 3000) \n 3. Main Menu  \n \n Enter your number: ");
				int foodOption = sc.nextInt();
					if (foodOption!= 3) {
						switch(foodOption) {
						case 1:

							System.out.println("Burger Quantity: ");
							int quantity = sc.nextInt();
							burger= quantity*2500;
							System.out.println("MMK " +burger);

							break;
						case 2:
							System.out.println("Sandwich Quantity: ");
								quantity = sc.nextInt();
							sandwich = quantity * 3000;
							System.out.println("MMK " +sandwich);

							break;
						default:
							System.out.println("Invalid");

							break;
						}
					}

				break;
			case 2: // show drink menu
				System.out.println(" Drink Menu \n \n 1. Coffee (MMK 1500) \n 2. Tea (MMK 1500 \n 3. Main Menu");
				int drinkOption = sc.nextInt();
				if (drinkOption!= 3) {
					switch(drinkOption) {
					case 1:
						System.out.println("Quantity: ");
						int quantity = sc.nextInt();
						coffee= quantity*1500;
						System.out.println("MMK "+coffee);

						break;
					case 2:
						System.out.println("Quantity: ");
						quantity = sc.nextInt();
						tea = quantity * 1500;
						System.out.println("MMK " + tea);

						break;
					default:
						System.out.println("Invalid");
						break;
					}
				}

				break;
			case 3:
				balance = burger + sandwich + coffee + tea;
				System.out.println(" Balance: MMK "+ balance);


				break;
			}


			if (option == 4) {
				System.out.println("Thank you!");
			}
		}
		option = sc.nextInt();
		}
	}