#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,k;
    cin>>n;
    vector<int> c;
    for(int i=0;i<n;i++){
        cin>>k;
        c.push_back(k);
    }
    sort(c.begin(),c.end(),[](const int a, const int b) {return a > b; });
    long long cal=0;
    for(int i=0;i<n;i++){
        cal+=((long long)pow(2,i)*c[i]);
    }
    cout<<cal;
    return 0;
}