using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var items = new List<int>();        

        for (var index = 1; index < 11; index = index + 3)

        {

            items.Add(index);

        }

        Console.WriteLine(string.Join(",", items));     

    }

}