#include <iostream>

#include <cctype>

using namespace std;

int main() {

    char input; //holds the input value
    string line;
    int output = 0; //holds the output value of the result
    int n;

    while (cin.get(input)) { // loop until end of file


            input = toupper(input); // if the input is lowercase convert to upper case

//value of the first symbol if it is Thousand (M)

            if (input == 'M')

                output = output + 1000;

//check if the first symbol is Five hundred(D)

            else if (input == 'D') {

                input = cin.peek(); //read next character in the input stream

                input = toupper(input);

//if the next symbol is of a higher value then subtract, else add the value to the result


                if (input == 'M') {

                    output = output - 500;

                    continue;

                } else {

                    output = output + 500;

                    continue;

                }

            }

//check if the first symbol is Hundred (C)

            else if (input == 'C') {

                input = cin.peek(); //read next

                input = toupper(input);

                if (input == 'M' || input == 'D') {

                    output = output - 100;

                    continue;

                } else {

                    output = output + 100;

                    continue;

                }

            }

//check if the first symbol is Fifty (L)

            else if (input == 'L') {

                input = cin.peek();

                input = toupper(input);


                output = output + 50;

                continue;


            }

//check if the first symbol is Ten (X)

            else if (input == 'X') {

                input = cin.peek(); //read next

                input = toupper(input); //convert to upper case

//check if next  symbol is M or D or C or L

                if (input == 'C' || input == 'L') {

                    output = output - 10;

                    continue;

                } else {

                    output = output + 10;

                    continue;

                }

            }

//check if the first symbol is Five (V)

            else if (input == 'V') {

                input = cin.peek();

                input = toupper(input);


                output = output + 5;

                continue;


            }

//check if the first symbol is One(I)

            else if (input == 'I') {

                input = cin.peek();

                input = toupper(input);

                if (input == 'X' || input == 'V') {

                    output = output - 1;

                    continue;

                } else {

                    output = output + 1;

                    continue;

                }

            } else break;

        }


        cout << output << endl;

        return 0;



}