#include <bits/stdc++.h>
using namespace std;
const int N = 44;
int a[N];
int main() {
	int n;
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	sort(a, a + n);
	reverse(a, a + n);
	long long sum = 0;
	long long pw = 1;
	for (int i = 0; i < n; i++) {
		sum += 1LL * a[i] * pw;
		pw *= 2;
	}
	cout << sum << "\n";

}