import Control.Applicative
import Control.Monad

main :: IO ()
main = solve <$> f >>= putStrLn
  where
    f = map read <$> words <$> getLine

solve :: [Int] -> String
solve [a, b, c]
  | null ps = "Impossible"
  | otherwise = show . minimum $ ps
  where
    ps = do
      ac <- [0 .. a]
      bc <- [0 .. b]
      let py = ac + 10 * bc
      p <- [1 .. py]
      let r = py - p
      let (u, v) = divMod r 10
      guard $ a - ac + b - bc + u + v == c
      return p