using System;

public class StartUp

{

    public static void Main()

    {

        string result = "";

        int num = int.Parse(Console.ReadLine());

        int thousands = num / 1000;

        int hundreds = (num / 100) % 10;

        int tens = (num / 10) % 10;

        int ones = num % 10;

        switch (thousands)

        {

            case 1:

                result += "M";

                break;

            case 2:

                result += "MM";

                break;

            case 3:

                result += "MMM"; 

                break;                

        }

        switch (hundreds)

        {

            case 1:

                result += "C";

                break;

            case 2:

                result += "CC";

                break;

            case 3:

                result += "CCC";

                break;

            case 4:

                result += "CD";

                break;

            case 5:

                result += "D";

                break;

            case 6:

                result += "DC";

                break;

            case 7:

                result += "DCC";

                break;

            case 8:

                result += "DCCC";

                break;

            case 9:

                result += "CM";

                break;

        }

        switch (tens)

        {

            case 1:

                result += "X";

                break;

            case 2:

                result += "XX";

                break;

            case 3:

                result += "XXX";

                break;

            case 4:

                result += "XL";

                break;

            case 5:

                result += "L";

                    break;

            case 6:

                result += "LX";

                break;

            case 7:

                result += "LXX";

                break;

            case 8:

                result += "LXXX";

                break;

            case 9:

                result += "XC";

                break;

        }

        switch (ones)

        {

            case 1:

                result += "I";

                break;

            case 2:

                result += "II";

                break;

            case 3:

                result += "III";

                break;

            case 4:

                result += "IV";

                break;

            case 5:

                result += "V";

                break;

            case 6:

                result += "VI";

                break;

            case 7:

                result += "VII";

                break;

            case 8:

                result += "VIII";

                break;

            case 9:

                result += "IX";

                break;

        }

        Console.WriteLine(result);

    }

}