using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<double> amounts = new List<double>

        {

            0.0184432468325,

            0.00237392482309,

            0.00043930984274,

            0.00000000001279,

            0.123000004234

        };

        foreach (var amount in amounts)

        {

            Console.WriteLine(TruncateLesserThanZeroCryptoAmt(amount));

        }

    }

    public static string TruncateLesserThanZeroCryptoAmt(double amount)

    {

        Regex regex = new Regex("^(0.0*\\d{3})");

        var match = regex.Match(String.Format("{0:F20}", amount));

        return match.Value;

    }

}