using System;

public class Program

{

    public static void Main()

    {

​

        int i,sum = 0,avg;

        int [] student = new int [6];

        for (i=0; i<=5; i++)

        {

            Console.Write("insert a grade: ");

            student [i] = int.Parse(Console.ReadLine());

            sum += student[i];

        }

        Console.WriteLine("the sum  is:{0}", sum);

        avg = sum/6;

        Console.WriteLine("the average is:{0}",avg);

        if student  

    }

}