import java.util.*

class StringIterator(val s : String){
  inline fun next() = if (i < s.length) s[i++] else throw NoSuchElementException()
  inline fun hasNext() = i < s.length
  private var i = 0
}
 
inline fun String.iterator() = StringIterator(this)

fun main(args : Array<String>) {
  if (args.size == 0) {
    System.out?.println("Please provide a name as a command-line argument")
    return
  }
  val line = args[0]
  
  var sum = 0
  var prev = 0
  var prevAdded = 1000
  
  for (c in line) {
    val current = when (c) {
      'I','i' -> 1
      'V','v' -> 5
      'X','x' -> 10
      'L','l' -> 50
      'C','c' -> 100
      'D','d' -> 500
      'M','m' -> 1000
      else -> -1
    }
    if (current == -1) {
      System.out?.println("Unknown symbol: ${c}")
      return
    }
    if (prev == 0) {
      prev = current
    } else if (prev >= current) {
      sum += prev
      if (prevAdded < prev) {
        System.out?.println("Erroneous rome number - wrong digits order!")
        return
      }
      prevAdded = prev
      prev = current
    } else {         
      prev = current - prev
    }    
  }
  
  if (prevAdded < prev) {
    System.out?.println("Erroneous rome number - wrong digits order!")
    return
  }
  sum += prev
  
  System.out?.println(sum)
  
}