def playWithAge():
	'''Simple function to tell your birthyear'''
	
	# new constant value
	NOW = 2018

	print('Which year were you born in?')

	# instantiation of the problem
	year = input()

	# new variable
	age = NOW - int(year)

	# notice how maths is evaluated then printed
	print('You must be '+str(age-1)+' or '+str(age))

playWithAge()