using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(new Test(1).GetHashCode());

        Console.WriteLine(new Test(1).GetHashCode());

        Console.WriteLine(new Test(2).GetHashCode());

        Console.WriteLine(new Test(10).GetHashCode());

        Console.WriteLine(new Test(100).GetHashCode());

    }

}

​

public class Test

{

    public int X

    {

        get;

        set;

    }

​

    public Test(int x)

    {

        if (x < 0)

            throw new ArgumentOutOfRangeException(nameof(x));

        X = x;

    }

​

    public override int GetHashCode()

    {

        unchecked

        {

            int hash = (int)2166136261;

            hash = (hash ^ X.GetHashCode()) * 16777619;

            return hash;

        }

    }

}