#![allow(non_snake_case)]

use std::io::{ self, prelude::* };

macro_rules! pick {
    ($tokens:expr) => {
        $tokens.next().unwrap().parse().expect("parse error")
    }
}

fn main() {
    let mut s = String::new();
    io::stdin().read_to_string(&mut s).expect("i/o error");
    let mut tokens = s.split_whitespace();

    let N: i64 = pick!(tokens);
    let P: f64 = pick!(tokens);

    let mut v = vec![1.0; (N+1) as usize];
    for i in 2..=N {
        for j in (2*i..).step_by(i as usize) {
            if j > N { break; }
            v[j as usize] *= 1.0 - P;
        }
    }

    let ans = v[2..].iter().sum::<f64>();

    println!("{}", ans);
}