using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter frist number");

        int num1 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter second number");

        int num2 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("sum : " + (num1 + num2));

    }

}