#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 */   
    long n,sum=0;
    cin>>n;
    vector<long>v(n);
    for(int i=0;i<n;i++)
        cin>>v[i];
    sort(v.rbegin(),v.rend());
    
    for(int i=0;i<n;i++)
        sum+=v[i]*pow(2,i);
    
    cout<<sum<<endl;
    return 0;
}