using System;

public class Program

{

    public static void Main()

    {

        double a ,b ,c ,t ;

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

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

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

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

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

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

        //operation

        t = a + b + c ;

        //condition 1

        if (t >= 50)

        {

            Console.WriteLine("{0} greater than 50 .",t );

        }

        else

            Console.WriteLine("{0} less than 50 .",t );

    }

}