using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        StringBuilder sb = new StringBuilder();

        Console.WriteLine(sb.Append("product1").Append("product2").Append("product3"));

        for(var i = 0; i < 10; i++)

        {

            sb.Append(string.Format("product{0};", i));

        }

        Console.WriteLine(sb);

    }

}