Please show me step$-$by$-$step how you got the answer.

What does the following program do$?$

$.$ORIG x$3000$

LD R$2,$ZERO

LD R$0,$M$0$

LD R$1,$M$1$

LOOP BRz DONE

ADD R$2,$R$2,$R$0$

ADD R$1,$R$1,-1$

BR LOOP

DONE ST R$2,$RESULT

HALT

RESULT $.$FILL x$0000$

ZERO $.$FILL x$0000$

M$0.$FILL x$0004$

M$1.$FILL x$0803$

$.$END

b$.$ What value will be contained in RESULT after the program runs to completion? How do you know?