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

namespace _15.Fast_Prime_Checker
{
    class Program
    {
        static void Main(string[] args)
        {


            int n = int.Parse(Console.ReadLine());

            for (int i = 2; i <= n; i++)
            {
                bool check = true;
                for (int g = 2; g <= Math.Sqrt(i); g++)
                {
                    if (i % g == 0)
                    {
                        check = false;
                        break;
                    }
                }
                Console.WriteLine($"{i} -> {check}");
            }


        }
    }
}