#[allow(dead_code)]
#[allow(unused_imports)]
fn read<T: std::str::FromStr>() -> T {
    use std::io::*;
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}
fn main(){
    let n:usize = read();
    let mut a:Vec<i64> = (0..n).map(|_| read()).collect();
    a.sort();
    a.reverse();
    let mut con = 0;
    let mut ans = 0;
    let mut sum = 0;
    let mut cnt = 0;
    let mut floor = -1;
    let mut i = 0;
    while i < n {
        if con == 0 {
            con = 1;
        }else {
            con *= 2;
        }
        floor += 1;
        let mut cnt = 0;
        let mut sum = 0;
        while i < n && cnt < con {
            sum += a[i];
            cnt += 1;
            i += 1;
        }
        ans += floor * sum;
    } 
    println!("{}",ans);
}