Complete the following program that only adds integers that are even negatives. The program considers the NON$-$ZERO integers at labels N$1,$ N$2,$ and N$3$ and stores the sum of the appropriate integers in the memory at label SUM. It uses a subroutine at label CHKN to check each integer.

$.$ORIG x$3000$

LD R$0,$ N$1$

$[$ Select $]$

L$1$ ADD R$1,$ R$0,$ #$0$

LD R$0,$ N$2$

LEA R$6,$ CHKN

$[$ Select $]$

JMP R$6$

L$2$ ADD R$1,$ R$1,$ R$0$

LD R$0,$ N$3$

$[$ Select $]$

L$3$ ADD R$1,$ R$1,$ R$0$

ST R$1,$ SUM

HALT

CHKN ADD R$4,$ R$0,$ #$0$ ; move in to R$4$ for testing

$[$ Select $]$

AND R$4,$ R$4,$ x$0001$ ; right most bit is always $1$ if odd

$[$ Select $]$

WRONG AND R$0,$ R$0,$ #$0$ ; zero out wrong values

RETURN RET

N$1.$FILL ; value not shown

N$2.$FILL ; value not shown

N$3.$FILL ; value not shown

SUM $.$FILL #$0$

$.$END