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

namespace Convertor1
{
    class Program
    {
        static void Main(string[] args)
        {
            var sum = double.Parse(Console.ReadLine());
            var entry = Console.ReadLine();
            var exit = Console.ReadLine();

            var result0 = sum * 1.79549;
            var result1 = sum / 1.79549;
            var result2 = sum * 1.95583;
            var result3 = sum / 1.95583;
            var result4 = sum * 2.53405;
            var result5 = sum / 2.53405;
            var result6 = sum * (1.95583 / 1.79549);
            var result7 = sum * (1.79549 / 1.95583);
            var result8 = sum * (1.95583 / 2.53405);
            var result9 = sum * (2.53405 / 1.95583);
            var result10 = sum * (1.79549 / 2.53405);
            var result11 = sum * (2.53405 / 1.79549);


            if (entry == "USD")
            {
                if (exit == "BGN")
                    Console.WriteLine(" :" + Math.Round(result0, 2));
            }
            else if (entry == "BGN")
            {
                if (exit == "USD")
                    Console.WriteLine(":" + Math.Round(result1, 2));
            }

            if (entry == "EUR")

            {
                if (exit == "BGN")
                    Console.WriteLine(":" + Math.Round(result2, 2));
            }
            else if (entry == "BGN")
            {
                if (exit == "EUR")
                    Console.WriteLine(":" + Math.Round(result3, 2));
            }
            if (entry == "GBP")
            {
                if (exit == "BGN")
                    Console.WriteLine(":" + Math.Round(result4, 2));
            }

            else if (entry == "BGN")
            {
                if (exit == "GBP")
                    Console.WriteLine(":" + Math.Round(result5, 2));
            }
                if (entry == "EUR")
                {
                    if (exit == "USD")
                        Console.WriteLine(" :" + Math.Round(result6, 2));
                }
                else if (entry == "USD")
                {
                    if (exit == "EUR")
                        Console.WriteLine(":" + Math.Round(result7, 2));
                }

                if (entry == "EUR")

                {
                    if (exit == "GBP")
                        Console.WriteLine(":" + Math.Round(result8, 2));
                }
                else if (entry == "GBP")
                {
                    if (exit == "EUR")
                        Console.WriteLine(":" + Math.Round(result9, 2));
                }
                if (entry == "USD")
                {
                    if (exit == "GBP")
                        Console.WriteLine(":" + Math.Round(result10, 2));
                }

                else if (entry == "GBP")
                {
                    if (exit == "USD")
                        Console.WriteLine(":" + Math.Round(result11, 2));
                }
            }
        }
    }