using System;
using System.Collections;

public class Frobnikator
{
	public Frobnikator() 
	{
		const UInt32 SMALL_MASK = (1U << (24)) - 1; 
		const ulong BIG_MASK = ~((ulong)SMALL_MASK);  
		Hashtable table = new Hashtable(), inverseTable = new Hashtable();

		Object boxedKey = 0UL & BIG_MASK, boxedValue = 0U;
		table[boxedKey] = boxedValue;
		inverseTable[boxedValue] = boxedKey;
		
		boxedKey = 0xFFFFffffFFFFffffUL & BIG_MASK; boxedValue = unchecked(0xFFFFffffU << 24);
		table[ boxedKey ] = boxedValue;
		inverseTable[ boxedValue ] = boxedKey;
	}
}