use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let p: f64 = itr.next().unwrap().parse().unwrap();
    let q: f64 = itr.next().unwrap().parse().unwrap();

    // p + q * n * logn

    let mut ng = 1e18;
    let mut ok = 1.0;

    for _ in 0..10000 {
        let mid = (ok + ng) / 2.0;
        if mid * mid <= p + q * mid * mid.log2() {
            ok = mid;
        } else {
            ng = mid;
        }
    }
    println!("{:.10}", ok);
}