12. Currency Converter

using System;

namespace Demo
{
    class Demo
    {
        static void Main()
        {
            var value = decimal.Parse(Console.ReadLine());
            var firstCurrency = Console.ReadLine();
            var secondCurrency = Console.ReadLine();

            var bg = value;
            var result = 0.0m;

            if (firstCurrency == "USD")
            {
                bg = value * 1.79549m;
            }
            else if (firstCurrency == "EUR")
            {
                bg = value * 1.95583m;
            }
            else if (firstCurrency == "GBP")
            {
                bg = value * 2.53405m;
            }

            //output
            if (secondCurrency == "BGN")
            {
                result = bg;
                Console.WriteLine($"{result:f2} BGN");
            }
            else if(secondCurrency == "USD")
            {
                result = bg / 1.79549m;
                Console.WriteLine($"{result:f2} USD");
            }
            else if (secondCurrency == "EUR")
            {
                result = bg / 1.95583m;
                Console.WriteLine($"{result:f2} EUR");
            }
            else if (secondCurrency == "GBP")
            {
                result = bg / 2.53405m;
                Console.WriteLine($"{result:f2} GBP");
            }
        }
    }
}