#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

typedef vector<int> VI;

int main() {
	int n;
	cin >> n;
	VI c(n);
	for (int i = 0; i < n; ++i) cin>>c[i];
	sort(c.rbegin(), c.rend());
	long long int r = 0;
	long long int p = 1;
	for (int i = 0; i < n; ++i) {
		r += p*c[i];
		p *= 2;
	}
	cout << r << endl;
}