#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <queue>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    string s;
    cin >> s;

    int sum = 0;
    vector<bool> used(s.size());

    for (int i = 0; i + 1 < s.size(); i++) {
        if (used[i] || used[i + 1]) continue;
        if (s[i] == 'C' && s[i + 1] == 'M') {
            used[i] = true;
            used[i + 1] = true;
            sum += 900;
        }
    }

    for (int i = 0; i + 1 < s.size(); i++) {
        if (used[i] || used[i + 1]) continue;
        if (s[i] == 'C' && s[i + 1] == 'D') {
            used[i] = true;
            used[i + 1] = true;
            sum += 500;
        }
    }

    for (int i = 0; i + 1 < s.size(); i++) {
        if (used[i] || used[i + 1]) continue;
        if (s[i] == 'X' && s[i + 1] == 'C') {
            used[i] = true;
            used[i + 1] = true;
            sum += 90;
        }
    }

    for (int i = 0; i + 1 < s.size(); i++) {
        if (used[i] || used[i + 1]) continue;
        if (s[i] == 'X' && s[i + 1] == 'L') {
            used[i] = true;
            used[i + 1] = true;
            sum += 40;
        }
    }

    for (int i = 0; i + 1 < s.size(); i++) {
        if (used[i] || used[i + 1]) continue;
        if (s[i] == 'I' && s[i + 1] == 'X') {
            used[i] = true;
            used[i + 1] = true;
            sum += 9;
        }
    }

    for (int i = 0; i + 1 < s.size(); i++) {
        if (used[i] || used[i + 1]) continue;
        if (s[i] == 'I' && s[i + 1] == 'V') {
            used[i] = true;
            used[i + 1] = true;
            sum += 4;
        }
    }

    for (int i = 0; i < s.size(); i++) {
        if (used[i]) continue;
        if (s[i] == 'I') {
            sum++;
        }
        else if (s[i] == 'V') {
            sum += 5;
        }
        else if (s[i] == 'X') {
            sum += 10;
        }
        else if (s[i] == 'L') {
            sum += 50;
        }
        else if (s[i] == 'C') {
            sum += 100;
        }
        else if (s[i] == 'D') {
            sum += 500;
        }
        else if (s[i] == 'M') {
            sum += 1000;
        }
    }
    cout << sum;
}