using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        var sb1 = new StringBuilder();

        Console.WriteLine(sb1.GetHashCode());

        sb1.Append("some text");

        Console.WriteLine(sb1.GetHashCode());

        sb1.Append("more text");

        Console.WriteLine(sb1.GetHashCode());

    }

}