using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Coffe sizes: 1=small 2=medium 3=large");

        Console.Write("please enter your selection: ");

        string str = Console.ReadLine();

        int cost = 0;

        switch(str)

        {

            case "1":

            case "small":

            cost += 25;

            break;

            case "2":

            case "medium":

            cost += 50;

            break;

            case "3":

            case "large":

            cost += 75;

            break;

            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");

}

}