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

namespace ConsoleApplication20
{
    class Program
    {
        static void Main(string[] args)
        {
            long a, b, c;
            a = 0;
            while (a <= long.MaxValue)
            {
                c = 0;
                a++;
                for (b = 1; b <= a; b++)
                    if ((a % b) == 0)
                        c++;
                if (c == 2)
                    Console.WriteLine(a);
            }
        }
    }
}