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

bool wayToSort(int i, int j) { return i > j; }

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    
    long int n,i,j,k,l,s;
    cin>>n;
    
    vector<long int> c(n);
    
    for(i=0;i<n;i++)
        cin>>c[i];
    
    std::sort(c.begin(),c.end(), wayToSort);
    
    s=0;
    for(i=0;i<n;i++)
    {
        s+=pow(2,i)*c[i];   
    }
    cout<<s;
    return 0;
}