import strutils, sequtils, math

proc mymapIF(s:seq[string]):auto= result = (s[0].parseInt, s[1].parseFloat)

# (ΦωΦ)＜えせ
proc ese_sieve(n:int, p:float): seq[float] =
  result = newSeqWith(n+1, 1.0)
  result[0] = 0
  result[1] = 0
  for i in countup(2, n div 2):
    for j in countup(2*i, n, i):
      result[j] *= 1 - p

var
  (n, p) = stdin.readLine.split.mymapIF

var sieved = ese_sieve(n, p)
echo sum(sieved)