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

X = [0] * (N + 1)

for i in range(2, N + 1):
    for j in range(2 * i, N + 1, i):
        
        X[j] += 1
        
print(sum([(1 - p) ** X[i] for i in range(2, N + 1)]))