N,p = map(float,input().split()); N = int(N)
q = 1-p
ans = 0
A = [1]*(N+1)
for k in range(2,N+1): #2-N
    base = k*2
    while base <= N:
        A[base] *= q
        base += k
#print(A)
ans = sum(A[2:])
print(ans)