org 00h
	mov R1, #6h; X
	mov R2, #2h; Y
	mov R3, #4h; Z
	mov A, R1; A = R1
	mov B, #2h; B = 2
	div AB; A = X/2
	mov B,R3; B = Z;
	mul AB; Z*X/2
	mov R0, A; save A in R0
	mov A,R3; A = Z
	subb A,R2; Z-Y
	mov B, R1
	mul AB ; (Z-Y)X
	add A,R0
	mov 20h, A
end