use proconio::input;

fn main() {
    input! {
        c:[i32;4],
        l:f64,
        r:f64,
    }

    let ans = if c[3] != 0 {
        solve3(&c, l, r)
    } else if c[2] != 0 {
        solve2(&c, l, r)
    } else if c[1] != 0 {
        solve1(&c, l, r)
    } else {
        0.0
    };

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

fn solve3(c: &Vec<i32>, l: f64, r: f64) -> f64 {
    let mut ans = f(l, &c).abs().min(f(r, &c).abs());
    let d = c[2] * c[2] - 3 * c[1] * c[3];

    if d >= 0 {
        let x_0 = (-c[2] as f64 + (d as f64).sqrt()) / (3.0 * c[3] as f64);
        if l <= x_0 && x_0 <= r {
            ans = ans.min(f(x_0, &c).abs());
        }

        let x_1 = (-c[2] as f64 - (d as f64).sqrt()) / (3.0 * c[3] as f64);
        if l <= x_1 && x_1 <= r {
            ans = ans.min(f(x_1, &c).abs());
        }

        if f(x_0, &c) * f(x_1, &c) < 0.0 {
            ans = 0.0;
        }
    }

    ans
}

fn solve2(c: &Vec<i32>, l: f64, r: f64) -> f64 {
    let mut ans = f(l, &c).abs().min(f(r, &c).abs());
    let x = -c[1] as f64 / (2.0 * c[2] as f64);
    if l<=x&&x<=r{
        ans = ans.min(f(x, &c).abs());
    }

    ans
}

fn solve1(c: &Vec<i32>, l: f64, r: f64) -> f64 {
    let ans = f(l, &c).abs().min(f(r, &c).abs());
    ans
}

fn f(x: f64, c: &Vec<i32>) -> f64 {
    c[0] as f64 + c[1] as f64 * x + c[2] as f64 * x * x + c[3] as f64 * x * x * x
}