12.Currency Converter-variant2

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

class Program
{
    static void Main(string[] args)
    {
        //1BGN=1.79549USD
        //1BGN=1.95583EUR
        //1BGN=2.53405GBP


        double input = double.Parse(Console.ReadLine());
        string currency = Console.ReadLine();
        string currencyOutPut = Console.ReadLine();
        double result;

        double BGNtoUSD = 1.79549;
        double BGNtoEUR = 1.95583;
        double BGNtoGBP = 2.53405;
        if (currency == "BGN")
        {
            switch (currencyOutPut)
            {
                case "USD":
                    result = input * BGNtoUSD;
                    Console.WriteLine("{0:F2} USD", result);
                    break;
                case "EUR":
                    result = input / BGNtoEUR;
                    Console.WriteLine("{0:F2} EUR", result);
                    break;
                case "GBP":
                    result = input * BGNtoGBP;
                    Console.WriteLine("{0:F2} GBP", result);
                    break;
                default:
                    break;
            }
        }

        double USDtoBGN = 1 / 1.79549;
        double USDtoEUR = 1.95583 / 1.79549;
        double USDtoGBP = 2.53405 / 1.79549;

        if (currency == "USD")
        {
            switch (currencyOutPut)
            {
                case "BGN":
                    result = input / USDtoBGN;
                    Console.WriteLine("{0:F2} BGN", result);
                    break;
                case "EUR":
                    result = input / USDtoEUR;
                    Console.WriteLine("{0:F2} EUR", result);
                    break;
                case "GBP":
                    result = input * USDtoGBP;
                    Console.WriteLine("{0:F2} GBP", result);
                    break;
                default:
                    break;
            }
        }

        double EURtoBGN = 1 / 1.95583;
        double EURtoUSD = 1.95583 / 1.79549;
        double EURtoGBP = 2.53405 / 1.95583;

        if (currency == "EUR")
        {
            switch (currencyOutPut)
            {
                case "BGN":
                    result = input / EURtoBGN;
                    Console.WriteLine("{0:F2} BGN", result);
                    break;
                case "USD":
                    result = input / EURtoUSD;
                    Console.WriteLine("{0:F2} USD", result);
                    break;
                case "GBP":
                    result = input / EURtoGBP;
                    Console.WriteLine("{0:F2} GBP", result);
                    break;
                default:
                    break;
            }
        }

        double GBPtoBGN = 1 / 2.53405;
        double GBPtoUSD = 1.79549 / 2.53405;
        double GBPtoEUR = 1.95583 / 2.53405;


        if (currency == "GBP")
        {
            switch (currencyOutPut)
            {
                case "BGN":
                    result = input / GBPtoBGN;
                    Console.WriteLine("{0:F2} BGN", result);
                    break;
                case "USD":
                    result = input / GBPtoUSD;
                    Console.WriteLine("{0:F2} USD", result);
                    break;
                case "EUR":
                    result = input * GBPtoEUR;
                    Console.WriteLine("{0:F2} EUR", result);
                    break;
                default:
                    break;
            }
        }
    }
}