using System;

​

public class Program

{

    static private double add(double a, double b)

    {

        double sum = a + b;

        return sum;

    }

​

    public static void Main()

    {

        {

            double x = 57;

            double y = -36.5639;

            Console.WriteLine(add(x, y));

            Console.WriteLine("Please enter two numbers");

            double input1 = double.Parse(Console.ReadLine());

            double input2 = double.Parse(Console.ReadLine());

            Console.WriteLine(add(input1, input2));

        }

    }

}