using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        HashSet<(long, string)> x = new HashSet<(long, string)>();

        x.Add((123L, "hi"));

        Console.WriteLine(x.Contains((100L+23, "hi")));

        Console.WriteLine(x.Contains((100L+200, "hi")));

        Console.WriteLine(x.Contains((100L+23, "hi there")));

    }

}