#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#define rep(i,n) for(int i(0); i<n; ++i)
using namespace std;
int main()
{
	int n;
	cin >> n;
	vector<int>a(n);
	rep(i, n) cin >> a[i];
	sort(a.begin(), a.end());
	long long ans(0);
	rep(i, n) 
		ans += a[n - i - 1] * pow(2, i);
	cout << ans;
}