#include <bits/stdc++.h>

using namespace std;

#define ii pair<int, int>
#define iii pair< pair<int, int>, int >
#define psi pair<string, int>
#define pis pair<int, string>
#define f first 
#define s second	
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mp make_pair
#define sqr(x) x*x

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n, a[41];
	cin >> n;
	ll res = 0, tmp = 1;
	for(int i=0;i<n;i++){
		cin >> a[i];
	}
	sort(a, a+n);
	for(int i=n-1;i>=0;i--){
		res+=tmp*a[i];
		tmp <<= 1;
	}
	cout << res;
	return 0;
}