import collections
n,p=map(float,input().split())
n=int(n)
l=[i for i in range(n+1)]
for i in range(2,n+1):
  if l[i]==i:
    for j in range(1,n//i+1):
      if i*j<=n:
        l[i*j]=i

ans=0
for i in range(2,n+1):
  x=i
  d=[]
  while x!=1:
    d.append(l[x])
    x//=l[x]
  d=collections.Counter(d)
  d=list(d.values())
  ct=1
  for j in range(len(d)):
    ct*=(d[j]+1)
  ct-=2
  ans+=(1-p)**ct
print(ans)