CurrencyConverter

namespace _1000DaysAfterBirth
{
    using System;
    using System.Collections.Generic;
    using System.Globalization;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;

    public class Program
    {
        public static void Main()
        {
            double amountToConvert = double.Parse(Console.ReadLine());
            string fromCurrency = Console.ReadLine();
            string toCurrency = Console.ReadLine();

            string bgnString = "BGN";
            string usdString = "USD";
            string eurString = "EUR";
            string gbpString = "GBP";

            double bgnValue = 1.0;
            double usdValue = 1.79549;
            double eurValue = 1.95583;
            double gbpValue = 2.53405;

            double fromValue = 0.0;
            double toValue = 0.0;
            if (fromCurrency == bgnString)
            {
                fromValue = bgnValue;

                if (toCurrency == usdString)
                {
                    toValue = usdValue;
                }
                else if (toCurrency == eurString)
                {
                    toValue = eurValue;
                }
                else if (toCurrency == gbpString)
                {
                    toValue = gbpValue;
                }
            }
            else if (fromCurrency == usdString)
            {
                fromValue = usdValue;

                if (toCurrency == bgnString)
                {
                    toValue = bgnValue;
                }
                else if (toCurrency == eurString)
                {
                    toValue = eurValue;
                }
                else if (toCurrency == gbpString)
                {
                    toValue = gbpValue;
                }
            }
            else if (fromCurrency == eurString)
            {
                fromValue = eurValue;

                if (toCurrency == bgnString)
                {
                    toValue = bgnValue;
                }
                else if (toCurrency == usdString)
                {
                    toValue = usdValue;
                }
                else if (toCurrency == gbpString)
                {
                    toValue = gbpValue;
                }
            }
            else if (fromCurrency == gbpString)
            {
                fromValue = gbpValue;

                if (toCurrency == bgnString)
                {
                    toValue = bgnValue;
                }
                else if (toCurrency == usdString)
                {
                    toValue = usdValue;
                }
                else if (toCurrency == eurString)
                {
                    toValue = eurValue;
                }
            }

            double result = (fromValue / toValue) * amountToConvert;

            Console.WriteLine($"{result:f2} {toCurrency}");
        }
    }
}