Cake

import java.util.Scanner;

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

        for (int i = cakeSize; i > -1; i = cakeSize) {
            String pieces = scanner.nextLine();
            if (pieces.equals("STOP")) {
                System.out.printf("%d pieces are left.", cakeSize);
                return;
            }
            Integer pieces2 = Integer.valueOf(pieces);
            cakeSize = cakeSize - pieces2;
        }
        System.out.printf("No more cake left! You need %d pieces more.", Math.abs(cakeSize));
    }
}