using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("2000,0.20 = {0}", FixUnknownCurrency("2000,0.20"));

        Console.WriteLine("2000.0,20 = {0}", FixUnknownCurrency("2000.0,20"));

        Console.WriteLine("2000.00 = {0}", FixUnknownCurrency("2000.00"));

        Console.WriteLine("2000000 = {0}", FixUnknownCurrency("2000000"));

        Console.WriteLine("20000,00 = {0}", FixUnknownCurrency("20000,00"));

        Console.WriteLine("200 = {0}", FixUnknownCurrency("200"));

        Console.WriteLine("2,00 = {0}", FixUnknownCurrency("2,00"));

        Console.WriteLine("2.00 = {0}", FixUnknownCurrency("2.00"));

        Console.WriteLine("1 = {0}", FixUnknownCurrency("1"));

    }

    static double FixUnknownCurrency(string amountText)

    {

        amountText = amountText?.Trim()?.Replace(" ", string.Empty);

        if(string.IsNullOrWhiteSpace(amountText))

            return 0d;  

        if(amountText.Length < 3)

            return double.Parse(amountText);

        var currencyDecimal = amountText[amountText.Length-3];

        if(Char.IsNumber(currencyDecimal))

            return double.Parse(amountText);

        if(currencyDecimal == '.' || currencyDecimal == ',')

        {

            amountText = amountText.Replace(",", string.Empty).Replace(".", string.Empty);

            return double.Parse(amountText) / 100d;

        }

        return double.Parse(amountText);

    }

}