using System;   

public class Program

{

    public static void Main()

    {

        int n = 2, i;

        float[] num = new float[2];

        double sum = 0.0, average;

        while(n>3 || n < 0)

        {

            Console.WriteLine("error");

            Console.WriteLine("Enter number: ");

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

        }

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

        {

            Console.WriteLine( ".Enter Number: ");

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

            sum = num[i] + sum;

        }

        average = sum /n;

        Console.Write("Average: ");

        Console.WriteLine( average);

        Console.Write("Sum: ");

        Console.WriteLine(sum);

        return ; 

}}