#!/usr/bin/env python
# -*- coding: utf-8 -*-

tmp = input().split(" ")
N = int(tmp[0])
p = 1.0 - float(tmp[1])

dp = [1.0] * (N + 1)
for i in range(2, N // 2 + 1):
    for j in range(2, N // i + 1):
        dp[i * j] *= p;
print(sum(dp[2:]))