Cake

import java.util.Scanner;

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

        int length = Integer.parseInt(scan.nextLine()); //A
        int weight = Integer.parseInt(scan.nextLine()); //B

        int cakeArea = length * weight; // A * B

        String input = scan.nextLine();

        while (!"STOP".equals(input)) {
            int number = Integer.parseInt(input);
            cakeArea -= number;
            if (cakeArea < 0) {
                System.out.printf("No more cake left! You need %d pieces more.", Math.abs(cakeArea));
                break;
            }
            input = scan.nextLine();
        }

        if (cakeArea >= 0) {
            System.out.printf("%d pieces are left.", cakeArea);
        }
    }
}