using System;
using System.Globalization;
using System.Linq;

public class Test
{
	public static void Main()
	{
	       double d1 = 1d;
           double d2 = 0.2423423d;
           double d3 = 0.1d;
           double d4 = 1234d;
           Console.WriteLine(d1.ToString("N1"));
           Console.WriteLine(d2.ToString("N1"));
           Console.WriteLine(d3.ToString("N1"));
           Console.WriteLine(d4.ToString("N1"));
	}
}