fn main() {
    let mut xx = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut xx).ok();
    let xx: Vec<f64> = xx.split_whitespace().flat_map(str::parse).collect();

    let mut lower = 0.;
    let mut upper = f64::MAX.sqrt();
    let mut n = 0.;
    while upper - lower > 10f64.powi(-5) && (upper - lower) / lower > 10f64.powi(-5) {
        n = (lower + upper) / 2.;
        if n.powi(2) > (xx[1] * n).mul_add(n.log2(), xx[0]) {
            upper = n;
        } else {
            lower = n;
        }
    }

    println!("{n}");
}