using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static string zbir(int zb)
        {
            string poruka;
            poruka = ("Zbir vasih ocenaje " + zb);
            return poruka;
        }
        static string prosek(int pr)
        {
            string poruka;
            poruka = ("Prosek vasih ocena je " + pr);
            return poruka;
        }

        static void Main(string[] args)
        {
            int n = 0;
            int pr = 0;
            int zb = 0;
            int y = 0;

            Console.WriteLine("Unesite broj predmeta koje imate!");
            n = Convert.ToInt32(Console.ReadLine());
            int[] a = new int[n];
            for (int i = 0; i < n; i++)
            {

                Console.WriteLine("unesite ocenu za predmet");

                try
                {
                    a[i] = Convert.ToInt32(Console.ReadLine());
                }
                catch
                {
                    Console.WriteLine("Uneli ste tekst, molimo vas unesite broj");
                    Console.WriteLine();
                    i--;

                }
            }

            Console.WriteLine("Za racunanje proseka stisnite slovo 'P'!");
            Console.WriteLine("Za racunanje zbira pritisnite slovo 'Z'!");
            ConsoleKeyInfo input = Console.ReadKey();

            if (input.KeyChar != 'z')
            {
                for (int i = 0; i < n; i++)
                {
                    y = y + a[i];
                }
                pr = y / n;
                Console.WriteLine(prosek(pr));
                Console.WriteLine("Da restartujete program pritisnite slovo 'R'.");
                ConsoleKeyInfo input1 = Console.ReadKey();
            }
            if (input.KeyChar != 'p')
            {
                for (int i = 0; i < n; i++)
                {
                    zb = zb + a[i];
                }
                Console.WriteLine(zbir(zb));
                Console.WriteLine("Da restartujete program pritisnite slovo 'R'.");
                ConsoleKeyInfo input1 = Console.ReadKey();
            }
        }
    }
}