using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter first number:");

        double n1 =  Convert.ToDouble(Console.ReadLine());

        Console.WriteLine("Please enter second number:");

        double n2 =  Convert.ToDouble(Console.ReadLine());

        Console.WriteLine("Please enter third number:");

        double n3 =  Convert.ToDouble(Console.ReadLine());

        if (n1 > n2)

            if (n1 > n3) 

        Console.WriteLine("The 1st number is the greatest");

        else 

            Console.WriteLine("The 3rd number is the greatest");

        else if (n2 >n3) 

            Console.WriteLine("The 2nd number is the greatest");

        else 

            Console.WriteLine("The 3rd number is the greatest");

    }

}