use std::io;
use std::io::prelude::*;

fn main() -> () {
    let stdin = io::read_to_string(io::stdin()).unwrap();
    let mut stdin = stdin.split_ascii_whitespace();
    let stdout = io::stdout();
    let mut stdout = io::BufWriter::new(stdout.lock());

    let n: usize = stdin.next().unwrap().parse::<usize>().unwrap();
    let p: f64 = stdin.next().unwrap().parse::<f64>().unwrap();
    let mut d = vec![0; n + 1];
    for i in 2..=n {
        let mut j = 2 * i;
        while j <= n {
            d[j] += 1;
            j += i;
        }
    }
    let res = (|| {
        let mut e = 0.0;
        for i in 2..=n {
            e += (1.0 - p).powi(d[i]);
        }
        e
    })();
    writeln!(stdout, "{}", res).unwrap_or(());
}