using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter a Roman Numeral (I, II, III, IV, V)\nI'll convert it to a decimal for you.");

        string rNumeral = Console.ReadLine();

        int dNumber;

        if (rNumeral == "I")

            dNumber = 1;

        else if (rNumeral == "II")

            dNumber = 2;

        else if (rNumeral == "III")

            dNumber = 3;

        else if (rNumeral == "IV")

            dNumber = 4;

        else if (rNumeral == "V")

            dNumber = 5;

        else

            dNumber = 0;

        if (dNumber == 0)

            Console.WriteLine("\nSorry, you entered an invalid entry.");

        else    

            Console.WriteLine("\n" + rNumeral + " equals " + dNumber);

    }

}