N, p = input().split()
N = int(N)
p = float(p)
A = [1.0]*(N+1)
A[0] = A[1] = 0.0
for i in range(2, N+1):
    for j in range(2*i, N+1, i):
        A[j] *= 1.0-p

print(sum(A))