fn run<'a, F: FnMut() -> &'a str, W: std::io::Write>(scan: &mut F, writer: &mut W) {
    macro_rules! scan {
        ([$t:tt; $n:expr]) => ((0..$n).map(|_| scan!($t)).collect::<Vec<_>>());
        (($($t:tt),*)) => (($(scan!($t)),*));
        (Usize1) => (scan!(usize) - 1);
        (Bytes) => (scan().as_bytes().to_vec());
        ($t:ty) => (scan().parse::<$t>().unwrap());
    }
    macro_rules! println {
        ($($arg:tt)*) => (writeln!(writer, $($arg)*).ok());
    }

    let n = scan!(usize);
    let mut a = scan!([i64; n]);

    a.sort();

    let mut ans = 0i64;
    let mut iter = a.iter().rev().peekable();
    'k: for k in 0.. {
        let mut x = 2i64.pow(k as u32);
        while let Some(a) = iter.next() {
            ans += a * k;
            x -= 1;
            if x == 0 {
                continue 'k;
            }
        }
        break;
    }
    println!("{}", ans);
}

fn main() {
    let ref mut buf = Vec::new();
    std::io::Read::read_to_end(&mut std::io::stdin(), buf).ok();
    let mut scanner = unsafe {
        std::str::from_utf8_unchecked(buf).split_ascii_whitespace()
    };
    let ref mut scan = || scanner.next().unwrap();

    let stdout = std::io::stdout();
    let ref mut writer = std::io::BufWriter::new(stdout.lock());

    run(scan, writer);
}