using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter number1");

        double a =double.Parse(Console.ReadLine());

        Console.WriteLine("enter number2");

        double b =double.Parse(Console.ReadLine());

        Console.WriteLine("enter number3");

        double c =double.Parse(Console.ReadLine());

        {

        if (a<b)

        if (a<c)

        if (b<c)

        Console.WriteLine(""+a+b+c);

        else

       Console.WriteLine(""+a+c+b);

        }

        {

        if (a<b)

        if (a<c)

        Console.WriteLine();

        else 

        Console.WriteLine(""+c+a+b);

        }

        {

        if (a<b)

        Console.WriteLine();

        else

        if (b<c)

        if (a<c)

        Console.WriteLine(""+b+a+c);    

        }

        {

        if (a<b)

        Console.WriteLine();

        else

        if (b<c)

        Console.WriteLine();

        else    

        Console.WriteLine(""+c+b+a);

        }

        {

        if (a<b)

        Console.WriteLine();

        else

        if (b<c)

        if (a<c)

        Console.WriteLine(""+b+a+c);

        else

        Console.WriteLine(""+b+c+a);

        }

    }

}

​