using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("1. (a+b)/2 :");

        int a,b;

        Console.WriteLine("1r too :");

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

        Console.WriteLine("2r too :");

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

        Console.WriteLine("==================");

        Console.WriteLine("Result: {0}",(a+b)/2);

    }

}