//By Don4ick
#include <bits/stdc++.h>

const int N = 45;

using namespace std;

int n;
long long a[N];

int main()
{
//	freopen(".in", "r", stdin);
//	freopen(".out", "w", stdout);

	long long ans = 0, cur = 1;
	cin >> n;
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	sort(a + 1, a + n + 1);
	for (int i = n; i >= 1; i--)
	{
		ans += cur * a[i];
		cur *= 2;
	}
	cout << ans << endl;

	return 0;
}