this is the assembly code I have but the output for W is coming to $=38$ when I need it to $=42,$ holding true to the equation W$=($X$+$Y$-$P$+$Q$)$: ; INSERT YOUR CODE HERE

ld a$,22$;

ld $($X$),$ a;

ld a$,10$;

ld $($Y$),$ a;

ld a$,30$;

ld $($P$),$ a;

ld a$,40$;

ld $($Q$),$ a;

;

; compute for w

ld a$,($X$)$;

ld b$,$ a;

ld a$,($Y$)$;

add a$,$ b;

ld b$,$ a;

ld a$,($P$)$;

sub b;

ld b$,$ a;

ld a$,($Q$)$;

add a$,$ b;

ld $($W$),$ a;