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

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {

            double bgnValue = 1;
            double usdValue = 1.79549;
            double eurValue = 1.95583;
            double gbpValue = 2.53405;

            double price = double.Parse(Console.ReadLine());

            var input = Console.ReadLine();
            var output = Console.ReadLine();

            double valueInput = 0;
            double valueOutput = 0;

            if (input == "bgn")
            {
                 valueInput = (price * bgnValue);
            }

            if (input == "usd")
            {
                 valueInput = (price * usdValue);
            }

            if (input == "eur")
            {
                 valueInput = (price * eurValue);
            }

            if (input == "gbp")
            {
                 valueInput = (price * gbpValue);
            }

            if (output == "bgn")
            {
                valueOutput = (valueInput / bgnValue);
            }
            if (output == "usd")
            {
                valueOutput = (valueInput / usdValue);
            }
            if (output == "eur")
            {
                valueOutput = (valueInput / eurValue);
            }
            if (output == "gbp")
            {
                valueOutput = (valueInput / gbpValue);
            }

            Console.WriteLine($"{valueOutput:F2}");


            //Курс        USD     EUR      GBP
            // 1 BGN   1.79549 1.95583 2.53405


            //var input = Console.ReadLine();// Enter BGN, USD, EUR or GBP currency
            // var output = Console.ReadLine();// Enter BGN, USD, EUR or GBP currency


        }
    }
}