use proconio::input;

fn main() {
    input! {
        n: usize,
        a: [i64; n],
    }

    if n == 2 {
        println!("{}", a[0] * a[1]);
        return;
    }

    let mut min_max_left = vec![(0, 0)];
    for i in 0 .. n {
        let &(min, max) = min_max_left.last().unwrap();
        let x = a[i];
        min_max_left.push((x.min(min + x), x.max(max + x)));
    }
    for i in 0 .. n {
        let (min1, max1) = min_max_left[i];
        let (min2, max2) = min_max_left[i + 1];
        min_max_left[i + 1] = (min1.min(min2), max1.max(max2));
    }

    let mut min_max_right = vec![(0, 0)];
    for i in (0 .. n).rev() {
        let &(min, max) = min_max_right.last().unwrap();
        let x = a[i];
        min_max_right.push((x.min(min + x), x.max(max + x)));
    }
    for i in 0 .. n {
        let (min1, max1) = min_max_right[i];
        let (min2, max2) = min_max_right[i + 1];
        min_max_right[i + 1] = (min1.min(min2), max1.max(max2));
    }

    let mut ans = 0;
    for i in 1 .. n {
        ans = ans.max(min_max_left[i].0 * min_max_right[n - i].0);
        ans = ans.max(min_max_left[i].1 * min_max_right[n - i].1);
    }

    println!("{ans}");
}