# a circuit with four layers and five AND or OR gates

INPUT(1)	# x1	
INPUT(2)	# x2
INPUT(3)	# x3
INPUT(4)	# x4
INPUT(5)	# x5
INPUT(6)	# x6

OUTPUT(11)	# y

7 = OR(1, 2)
8 = AND(7, 3)
9 = OR(8, 4)
10 = AND(5, 6)
11 = OR(9, 10)