import bisect
import os
from collections import Counter, deque
from fractions import gcd
from functools import lru_cache
from functools import reduce
import functools
import heapq
import itertools
import math
import numpy as np
import re
import sys

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

sys.setrecursionlimit(2147483647)
INF = float("inf")


IN = sys.stdin.readline().rstrip().split()
N = int(IN[0])
P = float(IN[1])
# 列挙される期待値=(1-p)^約数の数
E = np.ones(N + 1)
for n in range(2, N // 2 + 1):
    E[np.arange(n * 2, N + 1, n)] *= 1 - P
print(E[2:].sum())