import Data.List (foldr1)
import Control.Monad (guard, replicateM)

main = do
  l <- replicateM 3 $ fmap (read :: String -> Integer) getLine
  let num = foldr1 lcm l
      l' = map (num `div`) l
      den = foldr1 gcd $ do
        i <- [0..2]
        j <- [0..2]
        guard $ i /= j
        return $ l' !! i - l' !! j
      g = gcd num den
  putStrLn $ show (num `div` g) ++ "/" ++ show (den `div` g)