private int mapSingle(String s)
    {
		switch (s){
			case "M": return 1000;
			case "D": return 500;
			case "C": return 100;
			case "L": return 50;
			case "X": return 10;
			case "V": return 5;
			case "I": return 1;
			default: return 0; 
		}
    }