BR  Main     ;branch to location Main
		sum:	.WORD d#0	 ;set up word with zero as the contents
		num1: .BLOCK d#2	 ;set up a two byte block for num1
		num2: .BLOCK d#2	 ;set up a two byte block for num2
		num3: .BLOCK d#2	 ;set up a two byte block for num3
		Main: LOADA sum,d  ;load a copy of sum into accumulator
		DECI num1,d  ;read and store a decimal number in num1
		ADDA num1,d  ;add the contents of num1 to accumulator
		DECI num2,d  ;read and store a decimal number in num2
		ADDA num2,d  ;add the contents of num2 to accumulator
		DECI num3,d  ;read and store a decimal number in num3
		SUBA num3,d  ;subtract the contents of num3 from accumulator
		STOREA sum,d ;store contents of the accumulator into sum
		DECO sum,d   ;output the contents of sum
		STOP         ;stop the processing
		.END         ;end of the program