Untitled

import java.util.Scanner;

public class Main
{
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int length = Integer.parseInt(scanner.nextLine());
        int width = Integer.parseInt(scanner.nextLine());
        int cake = length * width;
        int piece = 0;
        
        while (cake > 0) {
            String input = scanner.nextLine();
            if (!input.equals("STOP")) {
                piece = Integer.parseInt(input);
                cake -= piece;
                if (cake < 0) {
                    System.out.printf("No more cake left! You need %d pieces more.", Math.abs(cake));
                    return;
                }
                
                } else {
                    break;
               }
                
        }
        
        System.out.printf("%d pieces are left.", cake);
        
    }
}