using System;

namespace ConvertorUSDtoBGN
{
    class Program
    {
        static void Main(string[] args)
        {
            const double currQuoteUSDperLev = 1.79549;

            double usdAmount = double.Parse(Console.ReadLine());
            double bgnValue = usdAmount * currQuoteUSDperLev;

            Console.WriteLine(bgnValue);

        }
    }
}