double n = double.Parse(Console.ReadLine());
            string vhod = Console.ReadLine();
            string izhod = Console.ReadLine();

            var BGN = 1;
            var USD = 1.79549;
            var EUR = 1.95583;
            var GBP = 2.53405;
            if (vhod == "USD" && izhod == "BGN")
            {
                Console.WriteLine("{0:f2}", n * USD);
            }
            else if (vhod == "BGN" && izhod == "EUR")
            {
                Console.WriteLine("{0:f2}", n / EUR);
            }
            else if (vhod == "EUR" && izhod == "GBP")
            {
                Console.WriteLine("{0:f2}", (n* EUR) / GBP);
            }
            else if (vhod == "USD" && izhod == "EUR")
            {
                Console.WriteLine("{0:f2}", (n * USD) / EUR);
            }
            else if (vhod == "GBP" && izhod == "USD")
            {
                Console.WriteLine("{0:f2}", (n * GBP) / USD);
            }