import os
import sys

import numpy as np

if os.getenv("LOCAL"):
    sys.stdin = open("_in.txt", "r")

sys.setrecursionlimit(10 ** 9)
INF = float("inf")
IINF = 10 ** 18
MOD = 10 ** 9 + 7
# MOD = 998244353

N, P = list(map(float, sys.stdin.buffer.readline().split()))
N = int(N)

exp = np.ones(N + 1)
exp[0] = 0
exp[1] = 0

for n, e in enumerate(exp[2:], 2):
    exp[n + n::n] *= 1 - P
# print(exp)
print(exp.sum())