package Main;

import java.util.HashMap;

public class DecimalNumberConverter {

    public static void main(String[] args) {
        System.out.println(convert("DCCCXXXIV"));
    }

    public static int convert(String value){
        HashMap<Character, Integer> romVal = new HashMap<>();
        romVal.put('M', 1000); romVal.put('D', 500); romVal.put('C', 100); romVal.put('L', 50); romVal.put('X', 10);
        romVal.put('V', 5); romVal.put('I', 1);
        char[] loop = value.toCharArray();
        int result = romVal.get(loop[loop.length-1]);
        for (int i = loop.length-2; i >= 0 ; i--) {
            if(romVal.get(loop[i]) < romVal.get(loop[i+1])){
                result -= romVal.get(loop[i]);
                continue;
            }
            result += romVal.get(loop[i]);
        }

        return result;
    }

}