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