using System;

class Example
{
   static void Main()
   {
       Console.WriteLine("Coffee sizes: 1=small 2=medium 3=large");
       Console.Write("Please enter your selection: ");
       string str = Console.ReadLine();
       int cost = 0;

       // Because of the goto statements in cases 2 and 3, the base cost of 25
       // cents is added to the additional cost for the medium and large sizes.
       switch (str)
       {
          case "1":
          case "small":
              cost += 25;
              break;
          case "2":
          case "medium":
              cost += 25;
              goto case "1";
          case "3":
          case "large":
              cost += 50;
              goto case "1";
          default:
              Console.WriteLine("Invalid selection. Please select 1, 2, or 3.");
              break;
      }
      if (cost != 0)
      {
          Console.WriteLine("Please insert {0} cents.", cost);
      }
      Console.WriteLine("Thank you for your business.");
   }
}
// The example displays output like the following:
//         Coffee sizes: 1=small 2=medium 3=large
//         Please enter your selection: 2
//         Please insert 50 cents.
//         Thank you for your business.