#include <stdio.h>
#include <iostream>
#include <stack>
#include <string>

using namespace std;

int getI(char c){
 switch (c) {
  case 'i' : return 0;
  case 'v' : return 1;
  case 'x' : return 2;
  case 'l' : return 3;
  case 'c' : return 4;
  case 'd' : return 5;
  case 'm' : return 6;
 }
 return -1;
}

int getNum(int i){
 switch (i){
  case 0 : return 1;
  case 1 : return 5;
  case 2 : return 10;
  case 3 : return 50;
  case 4 : return 100;
  case 5 : return 500;
  case 6 : return 1000;
 }
 return 0;
}

long read (char ch){
 stack<char> sstack;
 while(ch!='\n' && ch!=EOF){
  if (ch=='i' || ch=='v' || ch=='x' || ch=='l' || ch=='c' || ch=='d' || ch=='m') sstack.push(ch);
  ch = cin.get();
 }
 int count[7]={0,0,0,0,0,0,0};
 bool found[7]={false,false,false,false,false,false,false};
 while(!sstack.empty()){
  ch = sstack.top();
  int i=getI(ch);
  if ((i>=0) && (!found[i])){
   for (int j=0;j<i;j++){
    found[j]=true;
   }
   count[i]++;
  }
  sstack.pop();
 }
 long final=0;
 for (int i=6;i>=0;i--) {
  if (i%2==0 && count[i]>3) count[i]=3;
  if (i%2==1 && count[i]>1) count[i]=1;
  final+=count[i]*getNum(i);
 }
 return final;
}
int main (void){
 char c;
 while ((c=cin.get()) != EOF){
  cout << read(c) << endl;
 }
 return 0;
}