N,p=raw_input().split()
N=int(N)
p=float(p)
l=[0]*(N+1)
i=1
while True:
  i+=1
  if N<i*2: break
  for k in xrange(2,N/i+1):
    l[i*k]+=1
ans=0.0
for i in xrange(2,N+1):
  if l[i]==0: ans+=1.0
  else: ans+=(1.0-p)**l[i]
print ans