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

sum = 0

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

puts sum