fun convert(c : Char) : Int {
  when (c) {
    'I' -> return 1
    'V' -> return 5
    'X' -> return 10
    'L' -> return 50
    'C' -> return 100
    'D' -> return 500
    'M' -> return 1000
    else -> return 0
  }
}

fun prev(c : Char) : Char {
  when (c) {
    'M' -> return 'C'
    'C' -> return 'X'
    'X' -> return 'I'
    'V' -> return 'I'
    else -> return 'O'
  }
}

fun main(args : Array<String>) {
  val number = "MCMLXXXIV"

  var result : Int = 0

  for (var i in 0 .. number.length - 1) {
    val cur = number.get(i)
    val digit = convert(cur)
    if (i == number.length - 1) {
      result += digit
    } else {
      val next = number.get(i + 1)
      if (prev(next) == cur) {
        result += convert(next) - digit
        i++
      } else {
        result += digit
      }
    }
  }

  System.out?.println(result)
}