$[3]5.$ Suppose the variable $\backslash ($ X $\backslash )$ in the following Bare Bones program has the value $3$ when execution begins.

$```$

clear Y

decr X

while X not $0$:

decr X

incr Y

$```$

$($a$)$ What will be the value of X when the program terminates?

$($b$)$ What will be the value of Y when the program terminates?