/*
hack46a.cpp
This new file Created on 14-02-2017 at 21:32:13
Created By Gautam Kumar
*/

#include<bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define ll long long int


ll modpow(ll a,ll b)
{
	if(b==0)
	return 1;
	if(b==1)
	return a;
	ll temp = modpow(a,b/2);
	temp*=temp;
	//temp%=c;
	if(b%2==1)
		temp*=a;
	//temp%=c;
	return temp;
}
ll a[45];
int main()
{
	int n;
	cin>>n;
	int i;
	for(i=0;i<n;i++)
		cin>>a[i];
	sort(a,a+n);
	int j = 0;
	//int i;
	ll sum = 0;
	for(i=n-1;i>=0;i--)
	{
		ll res = modpow(2,j);
		res *= a[i];
		sum += res;
		j++;

	}
	cout<<sum<<endl;
	return 0;
}