N, P = input().split()
N = int(N)
P = float(P)

A = [1]*(N+1)
A[0], A[1] = 0, 0
for i in range(2, N+1):
    p = 1-P
    for j in range(i*2, N+1, i):
        A[j] *= p

print(sum(A))