#include<bits/stdc++.h>
#define ll long long
using namespace std;

int main()
{
	int n;
	cin>>n;
	vector<int> v(n);
	for(int i=0;i<n;i++)
		cin>>v[i];
	sort(v.begin(),v.end());
	
	ll int miles = 0;
	int k =0;
	for(int i=n-1;i>=0;i--)
	{
		miles += v[i]*pow(2,k);
        k++;
	}
	cout<<miles<<endl;
}