loop:   LDA  y      ; higher No.
        STA  temp
        ADD  x      ; lower No.
        STA  y
        LDA  temp
        STA  x

        LDA  count
        SUB  one
        BRZ  done

        STA  count
        JMP  loop

done:   LDA  y
        STP

one:         1
count:       8      ; n = 10
x:           1
y:           1
temp:        0