using System;

public class Program

{

    public static void Main()

    {

        string romanComp;   

        Console.WriteLine("Input the Roman Numeral Number: " );

        romanComp = Console.ReadLine().ToUpper();

        Console.WriteLine("In Arabic Number: ");

        Console.WriteLine(romanConvert(romanComp));

    }

    public static int romanConvert(string transform)

    {

        int count = 0;

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

        {

            if (i > 0 && switchChar(transform[i]) > switchChar(transform[i - 1]))

            {

                count += switchChar(transform[i]) - switchChar(transform[i - 1]) * 2;

            }

            else

            {

                count += switchChar(transform[i]);

            }

        }

        return count;

    }

    public static int switchChar(char romNumeral)

    {

        switch (romNumeral)

        {

            case 'I': return 1;

            case 'V': return 5;

            case 'X': return 10;

            case 'L': return 50;

            case 'C': return 100;

            case 'D': return 500;

            case 'M': return 1000;

            default: return 0;

        }

    }

}