C#Basics_CurrencyConverter

using System;

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

            Console.WriteLine("Please enter the amount you would like to convert");

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

            Console.WriteLine("Please choose which currencies you want to use");

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

            double BGN = 1;
            double USD = 1.79549;
            double EUR = 1.95583;
            double GBP = 2.53405;

            if (input == "BGN" & output == "USD")
                Console.WriteLine(Math.Round(amount * BGN / USD, 2));
            else if (input == "BGN" & output == "EUR")
                Console.WriteLine(Math.Round(amount * BGN / EUR, 2));
            else if (input == "BGN" & output == "GBP")
                Console.WriteLine(Math.Round(amount * BGN / GBP, 2));
            else if (input == "USD" & output == "EUR")
                Console.WriteLine(Math.Round(amount * USD / EUR, 2));
            else if (input == "USD" & output == "GBP")
                Console.WriteLine(Math.Round(amount * USD / GBP, 2));
            else if (input == "USD" & output == "BGN")
                Console.WriteLine(Math.Round(amount * USD / BGN, 2));
            else if (input == "EUR" & output == "USD")
                Console.WriteLine(Math.Round(amount * EUR / USD, 2));
            else if (input == "EUR" & output == "GBP")
                Console.WriteLine(Math.Round(amount * EUR / GBP, 2));
            else if (input == "EUR" & output == "BGN")
                Console.WriteLine(Math.Round(amount * EUR / BGN, 2));
            else if (input == "GBP" & output == "EUR")
                Console.WriteLine(Math.Round(amount * GBP / EUR, 2));
            else if (input == "GBP" & output == "USD")
                Console.WriteLine(Math.Round(amount * GBP / USD, 2));
            else if (input == "GBP" & output == "BGN")
                Console.WriteLine(Math.Round(amount * GBP / BGN, 2));


        }
    }
}