use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let mut a: Vec<i32> = (0..n)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();
    a.sort_by_key(|x| -x);
    let mut now = 0;
    let mut f = 0;
    let mut ans = 0;
    for &v in a.iter() {
        ans += f * v;
        now += 1;
        if (1 << f) == now {
            now = 0;
            f += 1;
        }
    }
    println!("{}", ans);
}