function
countdown
(
n
)
_
I
f
n
==
0
_
T
h
e
n
_
Print
_
Console
(
"Blastoff!"
)
_
E
l
s
e
_
Print
_
Console
(
n
)
countdown
(
n
-
1
)
_
E
n
d
_
I
f
end
countdown
(
5
)