import Control.Applicative
import Control.Monad
import Data.List
import Data.Array
import Data.Char

main = do
  [a, b] <- map (read::String -> Int) . words <$> getLine
  putStrLn $ if a `mod` 3 == 0 
    then "Possible" 
    else if b `mod` 3 == 0 
      then "Possible" 
      else if (a + b) `mod` 3 == 0 
        then "Possible" 
        else "Impossible"
