#include<bits/stdc++.h>
using namespace std;
long long A[]={1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,1048576,2097152,4194304,8388608,16777216,33554432,67108864,134217728,268435456,536870912,1073741824,2147483648,4294967296,8589934592,17179869184,34359738368,68719476736,137438953472,274877906944,549755813888,1099511627776};
int main()
{
	vector<long long> V;
	//ifstream cin("input.in");
	//ofstream cout("output.out");
	long long S=0,N,X,i=0;
	cin>>N;
	for(long i=0;i<N;i++)
	{
		cin>>X;
		V.push_back(X);
	}
	sort(V.rbegin(),V.rend());
	for(vector<long long>::iterator it=V.begin();it!=V.end();it++)
	{
		S+=((*it)*A[i]);
		i++;
	}
	cout<<S;
	return 0;
}