def make_divisors(n):
    divisors = []
    for i in range(1, int(n**0.5)+1):
        if n % i == 0:
            divisors.append(i)
            if i != n // i:
                divisors.append(n//i)
 
    return divisors

N, p = input().split()
N, p = int(N), float(p)
ans = 0

for i in range(2, N+1):
    c = len(make_divisors(i))
    ans += (1 - p) ** (c - 2)

print(ans)