value convertor

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

namespace _09.Converter4MeasuringUnits
{
    class Program
    {
        static void Main(string[] args)
        {
            var value = double.Parse(Console.ReadLine());
            var firstCurrency = Console.ReadLine();
            var secondCurrency = Console.ReadLine();

            var firstValue = 0d;
            var seconValue = 0d;

            var eu = 1.95583;
            var us = 1.79549;
            var gb = 2.53405;
            var bg = 1d;

            if (firstCurrency == "BGN")

                firstValue = bg;

            else if (firstCurrency == "USD")

                firstValue = us;

            else if (firstCurrency == "EUR")

                firstValue = eu;

            else if (firstCurrency == "GBP")

                firstValue = gb;

            if (secondCurrency == "BGN")

                seconValue = bg;

            else if (secondCurrency == "USD")

                seconValue = us;

            else if (secondCurrency == "EUR")

                seconValue = eu;

            else if (secondCurrency == "GBP")

                seconValue = gb;


            var result = value * (firstValue / seconValue);
            Console.WriteLine(Math.Round(result, 2));
        }
    }
}