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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n; cin >> n;
    int c[50];
    for (int i=0; i<n; ++i) cin >> c[i];
    sort(c, c+n);
    //for (int i=0; i<n; ++i) cout << c[i] << " "; cout << endl;
    
    long long cl = 0;
    int cnt = 0;
    for (int i=n-1; i>=0; --i) {
        cl += c[i] * pow(2, cnt);
        cnt++;
    }
    cout << cl << endl;
    return 0;
}