const SIZE: usize = 200000;

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 summary = a.iter().sum::<usize>();
    let mut result = summary * n;
    let mut cnts = vec![0usize; SIZE+1];
    for &v in a.iter() { cnts[v] += 1; }
    for i in (0..SIZE).rev() {
        cnts[i] += cnts[i+1];
    }
    let mut divides = vec![0usize; SIZE+1];
    for i in 1..=SIZE {
        for j in 1..=SIZE/i {
            divides[i] += cnts[i*j];
        }
    }
    for i in 0..n {
        result -= a[i] * divides[a[i]];
    }
    println!("{}", result);
}