06. Cake

import java.util.Scanner;

public class Cake {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int x = Integer.parseInt(scanner.nextLine());
        int y = Integer.parseInt(scanner.nextLine());
        int cakePieces = x * y;

        String input = "";
        while (cakePieces > 0 && !(input = scanner.nextLine()).equals("STOP")) {
            cakePieces -= Integer.parseInt(input);
        }

        if (cakePieces >= 0) {
            System.out.printf("%d pieces are left.\n", cakePieces);
        } else {
            System.out.printf("No more cake left! You need %d pieces more.\n", Math.abs(cakePieces));
        }
    }
}