use std::io::{read_to_string, stdin};

fn main() {
    let temp = read_to_string(stdin()).unwrap();
    let mut iter = temp
        .split_ascii_whitespace()
        .map(|x| x.parse::<usize>().unwrap());

    let n = iter.next().unwrap();
    let mut arr = (0..n).map(|_| iter.next().unwrap()).collect::<Vec<_>>();

    let mut stack = vec![(0, 0)];
    let mut res = 0;
    for i in 1..=n {
        let e = arr[i - 1];
        let (mut top_i, mut top_e) = *stack.last().unwrap();

        while top_e >= e {
            let (p_i, p_e) = stack.pop().unwrap();
            if stack.is_empty() {
                break;
            }
            (top_i, top_e) = *stack.last().unwrap();
            res = res.max((i - top_i - 1) * p_e);
            
        }
        if stack.is_empty() {
            stack.push((i, e));
            continue;
        }
        stack.push((i, e));
        res = res.max((i - top_i) * e);
    }
    while stack.len() > 1 {
        let (ti, te) = stack.pop().unwrap();
        let (top_i, top_e) = stack.last().unwrap();
        res = res.max((n - top_i) * te);
        
    }

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