using System;

using System.Text;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var counter = 5;

        var sb = new StringBuilder();

        for(var i = 1; i <= counter; ++i) {

            sb.Append(i);

            if (i != counter) {

               sb.Append(",");

            }

        }

        Console.WriteLine(sb);

    }

}