Торта

import java.util.Scanner;

public class demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int cakeWidth = Integer.parseInt(scanner.nextLine());
        int cakeLength = Integer.parseInt(scanner.nextLine());

        int cake = cakeWidth * cakeLength;

        while(true){
            String input = scanner.nextLine();

            if(input.equals("STOP")){
                break;
            }

            int pieces = Integer.parseInt(input);
            cake = cake - pieces;

            if(cake < 0){
                break;
            }
        }
        if(cake < 0){
            System.out.printf("No more cake left! You need %d pieces more.", Math.abs(cake));
        }else{
            System.out.printf("%d pieces are left.", cake);
        }
    }
}