def GenerateCacheKey(n, l1, l2):
	"""Generates a key that is unique for n, l1, l2
	
	Arguments:
		n {int} -- The number of items
		l1 {int} -- The remaining room in the knapsack one
		l2 {int} -- The remaining room in knapsack two
	
	Returns:
		String -- The unique key for the given parameters
	"""
	return str(n)+ "_" + str(l1) + "_" + str(l2)