import Control.Applicative

main :: IO ()
main = do
    [n, m] <- map read . words <$> getLine
    putStrLn $ solve n m

solve :: Int -> Int -> String
solve 1 0 = "Impossible"
solve 2 0 = "Impossible"
solve 3 3 = "Impossible"
solve 3 4 = "Impossible"
solve _ _ = "Possible"