CLEAR $R_0$

LOOP:

MOVE $1000(R_0)$

ADD $2000(R_0)$

STORE $3000(R_0)$

INCREMENT $R_0$

BRANCH$-$IF $R_0>99$ LOOP

MOVE $($SP$),R_0$

POP SP

MOVE $($SP$),R_1$

SUBTRACT $R_0,R_1,($SP$)$