# include <iostream>
# include <algorithm>
using namespace std;
typedef unsigned long long int ll;
ll c[45];
int main()
{
	int n;
	cin>>n;
	for(int i=0;i<n;i++)
		cin>>c[i];
	ll z=1;
	ll sum=0;
	sort(c,c+n);
	for(int i=n-1;i>=0;i--,z*=2ll)
		sum+=z*c[i];
	cout<<sum;
	return 0;
}