WHAT IS OUTPUT BY THE FOLLOWING SEGMENT OF CODE?

CLEARSTACK$($STACK$)$;

PUSH$($STACK$,2)$;

WHILE NOT EMPTYSTACK$($STACK$)$ DO

POP$($STACK$,$ N$)$;

Write$($N$)$;

IF N $<=8$

PUSH$($STACK$,2*$N$+1)$;

PUSH$($STACK$,2*$N$)$;

ENDIF

ENDWHILE