12. Currency Converter

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

namespace konvertor_valuti
{
    class Program
    {
        static void Main(string[] args)
        {
            var a = double.Parse(Console.ReadLine());
            var vhod = Console.ReadLine();
            var izdhod = Console.ReadLine();
            var BGN = 1;
            var USD = 1.79549;
            var EUR = 1.95583;
            var GBP = 2.53405;
            if ((vhod == "BGN") && (izdhod == "USD"))
            {
                Console.WriteLine(Math.Round(a / USD, 2));
            }

            else if ((vhod == "BGN") && (izdhod == "EUR"))
            {
                Console.WriteLine(Math.Round(a / EUR, 2));
            }
            else if ((vhod == "BGN") && (izdhod == "GBP"))
            {
                Console.WriteLine(Math.Round(a / GBP, 2));
            }
            if ((vhod == "USD") && (izdhod == "BGN"))
            {
                Console.WriteLine(Math.Round(a * USD, 2));
            }
            else if ((vhod == "USD") && (izdhod == "EUR"))
            {
                Console.WriteLine(Math.Round(a * USD / EUR, 2));
            }
            else if ((vhod == "USD") && (izdhod == "GBP"))
            {
                Console.WriteLine(Math.Round(a * USD / GBP, 2));
            }
            if ((vhod == "EUR") && (izdhod == "BGN"))
            {
                Console.WriteLine(Math.Round(a * EUR / BGN,2));
            }
            else if ((vhod == "EUR") && (izdhod == "USD"))
            {
                Console.WriteLine(Math.Round(a * EUR / USD, 2));
            }
            else if ((vhod == "EUR") && (izdhod == "GBP"))
            {
                Console.WriteLine(Math.Round(a * EUR / GBP, 2));
            }
            if ((vhod == "GBP") && (izdhod == "BGN"))
            {
                Console.WriteLine(Math.Round(a * GBP,2));
            }
            else if ((vhod == "GBP") && (izdhod == "EUR"))
            {
                Console.WriteLine(Math.Round(a * GBP / EUR, 2));
            }
            else if ((vhod == "GBP") && (izdhod == "USD"))
            {
                Console.WriteLine(Math.Round(a * GBP / USD,2));
            }
        }
    }
}