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().ToLower();
            var output = Console.ReadLine().ToLower();
            double valueInput;
            double valueOutput;
            if (input == "bgn")
            {
                valueInput = (price * bgnValue);
            }
            else if (input == "usd")
            {
                valueInput = (price * usdValue);
            }
            else if (input == "eur")
            {
                valueInput = (price * eurValue);
            }
            else
            {
                valueInput = (price * gbpValue);
            }
            if (output == "bgn")
            {
                valueOutput = (valueInput / bgnValue);
            }
            else if (output == "usd")
            {
                valueOutput = (valueInput / usdValue);
            }
            else if (output == "eur")
            {
                valueOutput = (valueInput / eurValue);
            }
            else
            {
                valueOutput = (valueInput / gbpValue);
            }
             Console.WriteLine(valueOutput);

            //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

        }
    }
}