"Average Value for CIS education documents" program

using System;

class program
{
    public static void Main()
    {
        int n;
        double average = 0, sum = 0;
        Console.Write("Введите количество оценок:\t");
        n = Convert.ToInt32(Console.ReadLine());
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
        {
            Console.Write("Оценка №{0}:\t", i + 1);
            a[i] = Convert.ToInt32(Console.ReadLine());
            sum += a[i];
        }
        average = sum / n;
        Console.Write("\nСреднее:\t{0:f1}", average);
        Console.ReadKey();
    }
}