import Control.Applicative
import Data.Array.IO
import Data.Array

readInt :: String -> Int
readInt = read

readDouble :: String -> Double
readDouble = read

sumA :: [Int] -> Array Int Double -> Double
sumA indexes ary = foldl (\ acc i -> acc + ary!i) 0.0 indexes

main :: IO()
main = do
  [ns,ps] <- words <$> getLine
  let n = readInt ns
  let m = n + 1
  let p = readDouble ps
  l <- newArray (2,m) 1.0 :: IO(IOArray Int Double)
  sequence_ [sequence_ [(writeArray l j) =<< (*) (1-p) <$> (readArray l j) | j <- [i+i,i+i+i..n]] | i <- [2,3..n] ]
  print =<< (sumA [2,3..n] <$> freeze l)