fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut s: Vec<usize> = vec![0; n];
    let mut ss: Vec<usize> = vec![0; n];
    let mut summary = 0;
    let mut ssummary = 0;
    for i in 0..n {
        summary += a[i];
        s[i] = summary;
        ssummary += s[i] - if i > 0 { s[i-1] } else { 0 };
        ssummary += i*a[i];
        ss[i] = ssummary;
    }
    println!("{:?}", s);
    println!("{:?}", ss);
    println!("{}", ss.iter().sum::<usize>());
}