import java.util.Scanner;


public class kkk {

	public static void main(String[] args) {
		Scanner see = new Scanner(System.in);
		String[] input = see.nextLine().trim().split(" +");
		double total = 0;
		for (int i = 0; i < input.length; i++) {
			double a = Double.parseDouble(input[i].substring(1, input[i].length()-1));
			if(input[i].charAt(0) >= 65 && input[i].charAt(0) <= 90){
				a/= (int) input[i].charAt(0)-64;
			}
			else if(input[i].charAt(0) >= 97 && input[i].charAt(0) <= 122){
				a*= (int) input[i].charAt(0)-96;
			}
			if(input[i].charAt(input[i].length()-1) >= 65 &&
			   input[i].charAt(input[i].length()-1) <= 90){
				a-= (int) input[i].charAt(input[i].length()-1)-64;
			}
			else if(input[i].charAt(input[i].length()-1) >= 97 &&
					 input[i].charAt(input[i].length()-1) <= 122){
				a+= (int) input[i].charAt(input[i].length()-1)-96;
			}
			total+= a;
		}
		System.out.printf("%.2f", total);

	}

}