using System;

using System.Collections.Generic;

​

public class Program

{

    private static Dictionary<char, int> romanNumeralDict = new Dictionary<char, int>()

    {

        {'I', 1},

        {'V', 5},

        {'X', 10},

        {'L', 50},

        {'C', 100},

        {'D', 500},

        {'M', 1000}

    };

    public static int RomanToInteger(string stringInput)

    {

        int convertedResult = 0;

        char previousRomanChar = stringInput[0];

        foreach (char currentChar in stringInput)

        {

            convertedResult += romanNumeralDict[currentChar];

            if (romanNumeralDict[previousRomanChar] < romanNumeralDict[currentChar])

            {

                convertedResult -= romanNumeralDict[previousRomanChar] * 2;

            }

            previousRomanChar = currentChar;

        }

        return convertedResult;

    }

​

​

    public static void Main(string[] args)

    {

        Console.Write("Enter the roman numeral: ");

        string inputString = Console.ReadLine();

        Console.WriteLine("In Arabic: " + RomanToInteger(inputString));

​

    }

}