#[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: usize = parse_next!(input);
    let p: f64 = parse_next!(input);

    let mut d_count = vec![0; n + 1];
    for i in 2..=n {
        let mut j = i * 2;
        while j <= n {
            d_count[j] += 1;
            j += i;
        }
    }

    let ans = (|| {
        let mut expv = 0.0;
        for i in 2..=n {
            expv += (1.0 - p).powi(d_count[i]);
        }
        expv
    })();

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