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

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            //int x;
            //x = 2;
            //do
            //{
            //    Console.WriteLine(x);
            //    x = x * 2;
            //    System.Threading.Thread.Sleep(500);
            //} while (x < 50);


            //Console.ReadKey();
            //}




                for (int x = 2; x < 100; x++)
                {
                    int isPrime = 0;

                    for (int y = 1; y < x; y++)
                    {
                        if (x % y == 0)
                            isPrime++;

                        if (isPrime == 2) break;
                    }
                    if (isPrime != 2)
                        Console.WriteLine(x);

                    isPrime = 0;
                }
                Console.ReadKey();
            }



    }
    }