function Hailstones(curr, count)
if curr==1: return count
count=count+1
if curr%2==0 : return Hailstones(curr/2, count)
return Hailstones((3*curr)+1, count)
end
print(Hailstones(13, 0))
ZnVuY3Rpb24gSGFpbHN0b25lcyhjdXJyLCBjb3VudCkKCWlmIGN1cnI9PTE6IHJldHVybiBjb3VudAoJY291bnQ9Y291bnQrMQoJaWYgY3VyciUyPT0wIDogIHJldHVybiBIYWlsc3RvbmVzKGN1cnIvMiwgY291bnQpCglyZXR1cm4gSGFpbHN0b25lcygoMypjdXJyKSsxLCBjb3VudCkKZW5kCgpwcmludChIYWlsc3RvbmVzKDEzLCAwKSk=