/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class RomanToNumber
{
    int value(char r)
    {
        if (r == 'I')
            return 1;
        if (r == 'V')
            return 5;
        if (r == 'X')
            return 10;
        if (r == 'L')
            return 50;
        if (r == 'C')
            return 100;
        if (r == 'D')
            return 500;
        if (r == 'M')
            return 1000;
        return -1;
    }
 
 int romanToDecimal(String str)
    {
        // Initialize result
        int res = 0;
 
        for (int i = 0; i < str.length(); i++)
        {
            // Getting value of symbol s[i]
            int s1 = value(str.charAt(i));
 
            // Getting value of symbol s[i+1]
            if (i + 1 < str.length())
            {
                int s2 = value(str.charAt(i + 1));
 
                // Comparing both values
                if (s1 >= s2)
                {
                    // Value of current symbol
                    // is greater or equalto
                    // the next symbol
                    res = res + s1;
                }
                else
                {
                    // Value of current symbol is
                    // less than the next symbol
                    res = res + s2 - s1;
                    i++;
                }
            }
            else
            {
                res = res + s1;
            }
        }
 
        return res;
    }
 
	public static void main (String[] args) throws java.lang.Exception
	{
        RomanToNumber ob = new RomanToNumber();
        Scanner s=new Scanner(System.in);
        // Considering inputs given are valid
        String str = s.nextLine();
        System.out.println("Integer form of Roman Numeral" + " is " + ob.romanToDecimal(str));
	}
}