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{-# OPTIONS_GHC -O2 -fforce-recomp #-}
module T22277 where
entry :: Int -> Int
entry n = case n of
0 -> f n (13,24)
_ -> f n (n,n)
where
f :: Int -> (Int,Int) -> Int
f m x = g m x
where
exit m = (length $ reverse $ reverse $ reverse $ reverse $ [0..m]) + n
g n p | even n = exit n
| n > 43 = g (n-1) p
| otherwise = fst p
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