Cake

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Cake
{
    class Program
    {
        static void Main(string[] args)
        {
            int width = int.Parse(Console.ReadLine());
            int length = int.Parse(Console.ReadLine());
            int cake = width * length;
            while (cake > 0)
            {
                string command = Console.ReadLine();
                if (command =="STOP")
                {
                    Console.WriteLine($"{cake} pieces are left.");
                    break;
                }
                else
                {
                    cake -= int.Parse(command);
                }
            }
            if (cake <= 0)
            {
                cake = Math.Abs(cake);
                Console.WriteLine($"No more cake left! You need {cake} pieces more.");
            }
        }
    }
}