using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(RomanNumeral("I"));

        Console.WriteLine(RomanNumeral("II"));

        Console.WriteLine(RomanNumeral("IV"));

        Console.WriteLine(RomanNumeral("VI"));

        Console.WriteLine(RomanNumeral("IX"));

        Console.WriteLine(RomanNumeral("IIX"));

    }

    public static int RomanNumeral(string numeral)

    {

        numeral = numeral.ToUpper();

        int totalValue = 0;

        int currentValue = 0;

        for (int i = 0; i < numeral.Length; i++)

        {

            currentValue = GetNumeralVal(numeral[i]);

            if (i < numeral.Length - 1 && currentValue < GetNumeralVal(numeral[i+1]))

            {

                totalValue += GetNumeralVal(numeral[i + 1]) - currentValue;

                i++;

            }

            else

            {

                totalValue += currentValue;

            }

        }

        return totalValue;

    }

    static int GetNumeralVal(char numeral)

    {

        int numeralVal = 0;

        switch (numeral)

        {

            case 'I':

                numeralVal = 1;

                break;

            case 'V':

                numeralVal = 5;

                break;

            case 'X':

                numeralVal = 10;

                break;

            case 'L':

                numeralVal = 50;

                break;

            case 'C':

                numeralVal = 100;

                break;

            case 'D':

                numeralVal = 500;

                break;

            case 'M':

                numeralVal = 1000;

                break;

            default:

                break;

        }

        return numeralVal;

    }

}