n,p=gets.split
n=n.to_i
p=p.to_f
q=1-p
seives=Array.new(n+1,1.0)
seives[0]=seives[1]=0.0
2.upto(n/2){|i|
	k=i+i
	while k<=n
		seives[k]*=q
		k+=i
	end
}
puts "%.9f"%seives.inject(:+)