Cake

import java.util.Scanner;

public class p04 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int widht = Integer.parseInt(scanner.nextLine());
        int height = Integer.parseInt(scanner.nextLine());

        int cakeArea = widht * height;

        while(true){

            String input = scanner.nextLine();

            if(input.equals("STOP")){
                break;
            }
            int pieces = Integer.parseInt(input);

            cakeArea -= pieces;

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

        System.out.printf("%d pieces are left.", cakeArea);
    }
}