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

int c[128];

void init(){
  c['I'] = 1;   c['V'] = 5;   c['X'] = 10;   c['L'] = 50; 
  c['C'] = 100; c['D'] = 500; c['M'] = 1000;
}

int main(){
  string str;

  init();

  while(cin >> str){
    int sum = 0;
   
    for(int i = 0 ; i < str.size()-1 ; i++){
      sum += c[str[i]]*((c[str[i]] < c[str[i+1]]) ? -1 : 1);
    }
    sum += c[str[str.size()-1]];

    cout << sum << endl;
  }

  return 0;
}