using System;

/*using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace met1
{*/
    class Program
    {
        static void Tombkiiras(int[] p)
        {
            for (int i = 0; i < p.Length; i++)
            {
                Console.Write(p[i] + " ");
            }
        }

        static int Osszeg(int[] q)
        {
            int sum = 0;
            for (int i = 0; i < q.Length; i++)
            {
                sum += q[i];
            }
            return sum;
        }

        static bool Primvizsgalat(int szam)
        {
            for (int i = 2; i < Math.Sqrt(szam); i++)
            {
                if (szam % i == 0)
                    return false;
            }
            return true;
        }

        static int Index(int[] r)
        {
            bool paros = false;
            for (int i = 0; i < r.Length; i++)
            {
                if (r[i] % 2==0)
                {
                    paros = true;
                    return i;
                }
            }
            return -1;
        }
        static void Main(string[] args)
        {
            int[] tomb = new int[20];
            Random r = new Random();
            for (int i = 0; i < tomb.Length; i++)
            {
                tomb[i] = r.Next(1, 101);
            }
            Tombkiiras(tomb);
            Console.WriteLine();
            Console.WriteLine("Összeg: {0}", Osszeg(tomb));
            bool prim = false;
            for (int i = 0; i < tomb.Length; i++)
            {

                if (Primvizsgalat(tomb[i]) == true )
                {
                    prim = true;
                }
            }
            Console.WriteLine("Van prímszám?:"+prim);

            if (Index(tomb) == -1)
                Console.WriteLine("Nem paros.");
            else
                Console.WriteLine("Van paros szam: " + Index(tomb));
            Console.ReadLine();
        }
    }