using System;
using System.IO;
using System.Collections;

namespace lista4zad2
{
    public class PrimeCollection : IEnumerable
    {
        IEnumerator IEnumerable.GetEnumerator()
        {
            return (IEnumerator) GetEnumerator();
        }

        public PrimeEnum GetEnumerator()
        {
            return new PrimeEnum();
        }
    }

    public class PrimeEnum : IEnumerator
    {
        int prime_num = 1;
        public bool MoveNext()
        {
            for (prime_num = prime_num + 1; prime_num <= Int32.MaxValue; prime_num++)
            {
                bool not_prime = false;
                for (int j = 2; j <= Math.Sqrt(prime_num); j++)
                {
                    if (prime_num % j == 0)
                    {
                        not_prime = true;
                        break;
                    }
                }
                if (!not_prime)
                {
                    break;
                }
            }
            if (prime_num >= Int32.MaxValue) return false;
            return true;
        }
        public void Reset()
        {
            prime_num = 1;
        }

        object IEnumerator.Current
        {
            get
            {
                return Current;
            }
        }

        public int Current
        {
            get
            {
                return prime_num;
            }
        }


    }

    public class lista4zad2
    {
        static void Main()
        {
            PrimeCollection pc = new PrimeCollection();
            foreach(int p in pc)
                Console.WriteLine(p);
        }
    }

}