using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static void Main()
    {
        string[] input = Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).ToArray();

        double totalSum = 0;

        foreach (var item in input)
        {
            if (item.Length > 1)
            {
                double sum = 0;

                char firstIndex = item[0];
                char secondIndex = item[item.Length - 1];

                double number = 0.0;

                if (item.Length > 2)
                {
                    number = double.Parse(item.Substring(1, item.Length - 2));
                }

                sum = GetFirstSum(firstIndex, number);
                sum = GetSecondSum(secondIndex, sum);
                totalSum += sum;
            }
        }

        Console.WriteLine($"{totalSum:f2}");
    }

    private static double GetSecondSum(char secondIndex, double sum)
    {
        double secondSum = sum;
        double pos = GetPosition(secondIndex);

        if (secondIndex >= 'a' && secondIndex <= 'z')
        {
            secondSum += pos;
        }
        else if (secondIndex >= 'A' && secondIndex <= 'Z')
        {
            secondSum -= pos;
        }

        return secondSum;
    }

    private static double GetFirstSum(char firstIndex, double number)
    {
        double sum = 0;
        double pos = GetPosition(firstIndex);

        if (firstIndex >= 'a' && firstIndex <= 'z')
        {
            sum = number * pos;
        }
        else if (firstIndex >= 'A' && firstIndex <= 'Z')
        {
            sum = number / pos;
        }

        return sum;
    }

    private static double GetPosition(char index)
    {
        double count = 0;

        char chek = char.ToLower(index);

        for (int i = 'a'; i <= 'z'; i++)
        {
            if (i > chek)
            {
                break;
            }
            count++;
        }
        return count;
    }
}