Consider the following code segment:

def fun$($par$)$:

if par :

return par$+1$

else:

return fun$($par$//2)+$ fun$($par$//3)$

$x=\{2$:$3,3$:$2,1$:$2,2$:$1\}$

for $i$ in $x$

$z=y[0]+x[2]$

for $x$ in $y$ :

$z+=x$

What will the following statement return?

fun$(z)$

$0$

$-1$

error

$9$