using System;

public class Program

{

    public static void Main()

    {

       Console.Write("Enter first number: ");

        double number1 = Convert.ToDouble(Console.ReadLine());

​

        Console.Write("Enter second number: ");

        double number2 = Convert.ToDouble(Console.ReadLine());

        double result = number1 + number2;

        Console.WriteLine("Сума {number1} і {number2} = {result}.");

    }

}