using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Welcome to Calculator");

        Console.WriteLine("Type the first value");

        int variable = Convert.ToDouble(Console.ReadLine());

        Console.WriteLine("$Your number id" + variable.GetType());

    }

    public double Sum(double a, double b)

    {

        return 0d;

    }

}