#[macro_export]
macro_rules! setup {
    { mut $input:ident: SplitWhitespace $(,)? } => {
        use std::io::Read;
        let mut buf = String::new();
        std::io::stdin().read_to_string(&mut buf).ok();
        let mut $input = buf.split_whitespace();
    };
}

#[macro_export]
macro_rules! parse_next {
    ($str_iter:expr) => {
        $str_iter.next().unwrap().parse().ok().unwrap()
    };
}

fn main() {
    setup! { mut input: SplitWhitespace };

    let n: u64 = parse_next!(input);
    let p: f64 = parse_next!(input);

    let ans = (|| {
        let mut expv = 0.0;
        for i in 2..=n {
            expv += (1.0 - p).powf(count_d(i) as f64);
        }
        expv
    })();

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

fn count_d(n: u64) -> u64 {
    let mut count = 0;
    let ub = (n as f64).sqrt().floor() as u64;
    for i in 2..=ub {
        // if i * i > n {
        //     break;
        // }
        if n % i == 0 {
            match i * i == n {
                true => count += 1,
                false => count += 2,
            }
        }
    }
    count
}