using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter number of students:");

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

        int[] grades = new int[students];

        for (int i = 0; i < 3; i++)

        {

            for (int j = 0; j < students; j++)

            {

                Console.WriteLine("Please enter grade for student #" + j);

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

                grades[j] += grade;

            }

        }

​

        for (int j = 0; j < students; j++)

        {

            Console.WriteLine("Average for student #{0} = {1}", j, grades[j] / 3);

        }

    }

}