package While_Loop.While_Loop_Exercise;

import java.util.Scanner;

public class E06Cake {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int cakeW = Integer.parseInt(scanner.nextLine());
        int cakeL = Integer.parseInt(scanner.nextLine());
        if (cakeW <= 0 || cakeL <= 0) {
            System.out.println("ERROR: NO CAKE");
            return;
        }
        String input = scanner.nextLine();
        int piecesAll = cakeW * cakeL;
        int piecesTaken = 0;

        while (!input.equals("STOP")) {
            int pieces = Integer.parseInt(input);
            piecesTaken += pieces;

            if (piecesTaken > piecesAll) {
                System.out.printf("No more cake left! You need %d pieces more.", piecesTaken - piecesAll);
                return;
            }
            input = scanner.nextLine();
        }

            System.out.printf("%d pieces are left.", piecesAll - piecesTaken );
    }
}