BR main
sum: .WORD 0x0000
num1: .BLOCK 2
num2: .BLOCK 2
num3: .BLOCK 2
negMsg: CHARO 0x0045,i
	BR finish
main: LDA sum,d
	DECI num1,d
	ADDA num1,d
	DECI num2,d
	ADDA num2,d
	DECI num3,d
	ADDA num3,d
	BRLT negMsg
	STA sum,d
	DECO sum,d
finish: STOP
	.END