#include <iostream>
#include <sstream>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <cctype>
#include <string>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <algorithm>
#include <functional>
#include <climits>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	//freopen("a.in", "r", stdin);
	//freopen("a.out", "w", stdout);
	/*long T, lp;
	long long ans;
	cin >> T;
	for (lp = 1;lp <= T;lp++)
	{
		cout << "Case #" << lp << ": " << ans << "\n";
	}*/
	int N,i;
	long long ans=0,mul=1;
	cin>>N;
	vector<int> v(N);
	for(i=0;i<N;i++)
		cin>>v[i];
	sort(v.rbegin(),v.rend());
	for(i=0;i<N;i++)
	{
		ans+=v[i]*mul;
		mul*=2;
	}
	cout<<ans<<"\n";





	return 0;
}