using System;

public class Program

{

    public static void Main()

    {

        int a;

        int b;

        int c;

        int division;

        Console.WriteLine("Insertar calificacion a");

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

        Console.WriteLine("Insertar calificacion b");

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

        Console.WriteLine("Insertar calificacion c");

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

       division =(a + b + c)/3;

        Console.WriteLine("Tu promedio es:" +division);

​

    }

}