const INF: f64 = (1usize << 60) as f64;

fn main() {
    let mut pq = String::new();
    std::io::stdin().read_line(&mut pq).ok();
    let pq: Vec<f64> = pq.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let p = pq[0];
    let q = pq[1];

    let mut upper = INF;
    let mut lower = 1.;
    for _ in 0..100 {
        let middle = (upper + lower) / 2.;
        if q * middle * middle.log2() + p >= middle * middle {
            lower = middle;
        } else {
            upper = middle;
        }
    }
    println!("{}", upper);
}