water dispenser

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

namespace Water_dispenser
{
    class Program
    {
        static void Main(string[] args)
        {

            int cupVolume = int.Parse(Console.ReadLine());
            int counter = 0;
            int overallVolume = 0;
            int volume = 0;

            string buttons;

            while ((buttons = Console.ReadLine())!=null && overallVolume<cupVolume)
            {

            switch(buttons)
            {
                case "Easy":

                    volume = 50;
                    break;
               case"Medium":
                     volume = 100;
                break;
               case"Hard":

                 volume = 200;
                break;
            }
                overallVolume += volume;

            counter++;

            }

                if (overallVolume > cupVolume)
                {
                   int spiltWater = overallVolume - cupVolume;
                    Console.WriteLine($"{spiltWater}ml has been spilled.");
                }
                else
                {
                Console.WriteLine($"The dispenser has been tapped {counter} times.");
                }
       }
    }
}