#[allow(dead_code)]
#[allow(unused_imports)]
fn read<T: std::str::FromStr>() -> T {
    use std::io::*;
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}

fn binary_search(p:f64,q:f64) -> f64 {
    let (mut lb , mut ub) = (0.0,1e15);
    for _ in 0..100 {
        let mid:f64 = (lb + ub) / 2.0;
        if mid <= q * mid.log2() + p / mid {
            lb = mid;
        }else{
            ub = mid;
        }
    }
    lb
}

fn main(){
    let p:usize = read();
    let q:usize = read();
    println!("{}",binary_search(p as f64,q as f64));
}