import Control.Applicative
import Control.Monad
import Data.Array.ST
import Data.Array.Unboxed
import Text.Printf

-- Reference: http://sucrose.hatenablog.com/entry/2014/10/10/235805
numDivisorsTable :: Int -> UArray Int Int
numDivisorsTable n = runSTUArray $ do
    t <- newArray (1, n) 0
    forM_ [1 .. n] $ \i -> do
        forM_ [i, 2 * i .. n] $ \j -> do
            writeArray t j . (+ 1) =<< readArray t j
    return t

computeProbability :: Double -> Int -> Double
computeProbability p n = sum $ map prob [2 .. n]
    where
        t = numDivisorsTable n
        prob i = (1 - p) ** (fromIntegral $ subtract 2 $ t ! i)

main :: IO ()
main = do
    [n, p] <- words <$> getLine
    printf "%.12f\n" $ computeProbability (read p) (read n)