using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<double> list = new List<double>()

        {

            2.7, -3.5, 0.6, 34.83, 7.458, 0, 9.20, -20.40, 12.2

        };

        int digits=0;

        double nr = Double.NaN;

        for(int i = 0; i < list.Count; ++i)

        {

            if((list[i] % 1) == 0) continue;    // If the number does not have digits: 5.0, 3.0, 7, etc.

                                                // https://stackoverflow.com/questions/2751593/how-to-determine-if-a-decimal-double-is-an-integer

            string nrstring = list[i].ToString();

            string aftercomma = nrstring.Split('.')[1];

            if(aftercomma.Length > digits)

            {

                digits = aftercomma.Length;

                nr = list[i];

            }

        }

        Console.WriteLine(nr);

    }

}