ORG 0
        MOV R7,#7
        MOV R0,#20H
        MOV R1,#30H
        MOV R2,1000
        MOV R3,100
        MOV R4,10
CYCLE:  MOV A,@R0
        SWAP A
        ANL A,#0FH
        MUL AR2
        MOV R5,A
        MOV A,#0FH
        MUL AR3
        ADD A,R5
        MOV B,@R1
        SWAP B
        ANL B,#0FH
        MUL BR4
        MOV R6,B
        MOV B,@R1
        ANL B,#0FH
        ADD B,R6
        ADD AB
        MOV @R1,A
        INC R1
        INC R1
        DJNZ R7,CYCLE
        END