#include <bits/stdc++.h>
#define endl '\n'
#define Int long long
#define pb push_back
#define mp make_pair
using namespace std;

const int maxN = 45;

int n, a[maxN];

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	cin>>n;
	for(int i = 0; i < n; i++) {
		cin>>a[i];
	}

	sort(a, a + n);

	Int curr_pow = 1, ans = 0;
	for(int i = n - 1; i >= 0; i--) {
		ans += curr_pow * a[i];
		curr_pow *= 2;
	}

	cout<<ans<<endl;
	return 0;
}