SS = gets.split
N = SS[0].to_i
P = SS[1].to_f

A = Array.new(N + 1, -1)
for n in 2..N do
  m = n
  while m <= N do
    A[m] += 1
    m += n
  end
end

sum = 0

TBL = {}
for n in 2..N do
  p = TBL[n]
  TBL[n] = p = (1 - P) ** A[n] unless p
  sum += p
end

puts sum