def categorizePerformance(SH, selectivity):
	"""Categorize
    Categorize the performance of the cture of MOF/CORE based on SH and selectivity
	SH above 5 and selectivity above 15000 are considered ideal
	3 categories exist and 3 number from 1 -> 3 are assigned correspondingly.
	Return:
	- category number: 0 | 1 | 2
    """
	if SH <= 5 and selectivity <= 15000:
		return 0
	# This type doesn't exist
	# elif SH > 5 and selectivity <=15000: 
	# 	return 2
	elif SH <= 5 and selectivity >= 15000:
		return 1
	else:
		return 2