import Data.List

dice_p :: Integer -> [Integer]
dice_p 0 = [1]
dice_p p = concat [ map (d*) (dice_p (p-1)) | d<-[2,3,5,7,11,13] ]

dice_c :: Integer -> [Integer]
dice_c 0 = [1]
dice_c p = concat [ map (d*) (dice_c (p-1)) | d<-[4,6,8,9,10,12] ]

main = do
	[p, c] <- getLine >>= return . map (read::String->Integer) . words
	let ps = map (\xs -> (head xs,(fromIntegral(length xs)))) (group (sort (dice_p p)))
	let cs = map (\xs -> (head xs,(fromIntegral(length xs)))) (group (sort (dice_c c)))

	print $ (\x -> (fromIntegral x) / (6^(p+c))) $ sum $ [ (\(p1, p2) (c1, c2) -> (p1*c1*p2*c2) ) p' c' | p' <- ps, c' <- cs ]