Dictionary Variant

using System;
using System.Collections.Generic;

class CurrencyConverter
{
    static void Main(string[] args)
    {
        Dictionary<string, decimal> curencies = new Dictionary<string, decimal>();
        curencies.Add("BGN", 1m);
        curencies.Add("USD", 1.79549m);
        curencies.Add("EUR", 1.95583m);
        curencies.Add("GBP", 2.53405m);

        decimal amount = decimal.Parse(Console.ReadLine());
        string inputCurrency = Console.ReadLine();
        string outputCurrency = Console.ReadLine();

        amount *= curencies[inputCurrency];
        amount /= curencies[outputCurrency];

        string result = $"{amount:F2} {outputCurrency}";
        Console.WriteLine(result);
    }
}