Cake

import java.util.Scanner;

public class Cake {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Integer width = Integer.parseInt(scanner.nextLine());
        Integer high = Integer.parseInt(scanner.nextLine());
        String piecesTaken = scanner.nextLine();
        Integer cakePieces = width * high;
        Integer counter = 0;

        while(!"STOP".equals(piecesTaken)){
            Integer pieces = Integer.valueOf(piecesTaken);
            counter += pieces;
            cakePieces -= pieces;
            if(cakePieces <= 0){
                break;
            }
            piecesTaken = scanner.nextLine();
        }
        Integer finalPieces = Math.abs(counter - (high*width));
        if((high*width) >= counter){
            System.out.printf("%d pieces are left.", finalPieces);
        }else {
            System.out.printf("No more cake left! You need %d pieces more.",finalPieces);
        }

    }
}