02. Numbers 1...N with Step 3

using System;

namespace Numbers_1N_with_Step_3
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            for(int i=1;i<=n;i+=3)
            {
                Console.WriteLine(i);
            }




        }
    }
}