using System;
using System.Collections.Generic;
 
public class MyCustomComparer : IComparer<int>
{
	private readonly int _cutOffPointInclusive;
 
	public MyCustomComparer(int cutOffPointInclusive)
	{
		_cutOffPointInclusive = cutOffPointInclusive;
	}
 
	public int Compare(int x, int y)
	{
		if (x <= _cutOffPointInclusive || y <= _cutOffPointInclusive)
		{
			return x.CompareTo(y);
		}
		else 
		{				
			return y.CompareTo(x);
		}
	}
}
 
public class Test
{
	public static void Main()
	{
		var testData = new List<int>{ 4,7,9,8,20,56,78,34,2,76,84,98 };
 
		testData.Sort(new MyCustomComparer(20));
 
		foreach (var i in testData)
		{
			Console.WriteLine(i);
		}
	}
}

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