#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) 
        cin >> a[i];
    sort(a.begin(), a.end());
    long long ans = 0;
    for (int i = 0; i < n; i++) 
        ans = ans * 2 + a[i];
    cout << ans;
    return 0;
}