Currency Converter C#

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

namespace Currency_Converter
{
    class Program
    {
        static void Main(string[] args)
        {
            double money = double.Parse(Console.ReadLine());
            string inputCurrency = Console.ReadLine();
            string outputCurrency = Console.ReadLine();
            double BGNTOUSD = 1.79549d;
            double BGNTOEUR = 1.95583d;
            double BGNTOGBP = 2.53405d;
            // BGN to others
            if (inputCurrency == "BGN")
            {
                if (outputCurrency == "USD")
                {
                    double USD = money / BGNTOUSD;
                    Console.WriteLine(Math.Round(USD, 2));
                }
                else if (outputCurrency == "EUR")
                {
                    double EUR = money / BGNTOEUR;
                    Console.WriteLine(Math.Round(EUR, 2));
                }
                else if (outputCurrency == "GBP")
                {
                    double GBP = money / BGNTOGBP;
                    Console.WriteLine(Math.Round(GBP, 2));
                }
            }
            //USD to others
            if (inputCurrency == "USD")
            {
                if (outputCurrency == "BGN")
                {
                    double BGN = money * BGNTOUSD;
                    Console.WriteLine(Math.Round(BGN, 2));
                }
                else if (outputCurrency == "EUR")
                {
                    double EUR = money * (BGNTOUSD/BGNTOEUR);
                    Console.WriteLine(Math.Round(EUR, 2));
                }
                else if (outputCurrency == "GBP")
                {
                    double GBP = money * (BGNTOUSD/BGNTOGBP);
                    Console.WriteLine(Math.Round(GBP, 2));
                }
            }
            // EUR to others
            if (inputCurrency == "EUR")
            {
                if (outputCurrency == "BGN")
                {
                    double BGN = money * (1/BGNTOEUR);
                    Console.WriteLine(Math.Round(BGN, 2));
                }
                else if (outputCurrency == "EUR")
                {
                    double USD = money * (BGNTOEUR / BGNTOUSD);
                    Console.WriteLine(Math.Round(USD, 2));
                }
                else if (outputCurrency == "GBP")
                {
                    double GBP = money * (BGNTOEUR / BGNTOGBP);
                    Console.WriteLine(Math.Round(GBP, 2));
                }
            }
            // GBP to others
            if (inputCurrency == "GBP")
            {
                if (outputCurrency == "BGN")
                {
                    double BGN = money * BGNTOGBP;
                    Console.WriteLine(Math.Round(BGN, 2));
                }
                else if (outputCurrency == "USD")
                {
                    double USD = money * (BGNTOGBP / BGNTOUSD);
                    Console.WriteLine(Math.Round(USD, 2));
                }
                else if (outputCurrency == "GBP")
                {
                    double EUR = money * (BGNTOGBP / BGNTOEUR);
                    Console.WriteLine(Math.Round(EUR, 2));
                }
            }
        }
    }
}