import Data.Ratio
import Data.Fixed
import Data.List
import Control.Monad

pos :: Integral a => a -> Ratio a -> Ratio a
pos t x = ((numerator x) % (t * denominator x)) `mod'` 1

solve :: Integral a => a -> a -> a -> Ratio a
solve t1 t2 t3 = t % (t - fromIntegral (head $ findIndices f l))
    where
        t = lcm (lcm t1 t2) t3
        l = map (t %) [t, t - 1..1]
        f x = pos t1 x == pos t2 x && pos t2 x == pos t3 x

trim :: String -> String
trim = filter (/= ' ') . map (\c -> if c == '%' then '/' else c)

main = do
    [t1, t2, t3] <- replicateM 3 readLn
    putStrLn $ trim $ show $ solve t1 t2 t3