#include <iostream>
#include <string>
using namespace std;

int ch(char c){
	switch (c){
	  case 'I':
		return 1;
	  case 'V':
		return 5;
	  case 'X':
		return 10;
	  case 'L':
		return 50;
	  case 'C':
		return 100;
	  case 'D':
		return 500;
	  case 'M':
		return 1000;
	}
	
}

int main()
{
	string s;
	int a,ans;
	while(cin >> s){
		a=0;
		ans=0;
		for(int i=s.size()-1;i>=0;--i){
			if(a>ch(s[i])){
				ans-=ch(s[i]);
			}else {
				ans += ch(s[i]);
			}
			a=ch(s[i]);
		}
		cout << ans << endl;
	}
}