#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> cal;
    for(int i=0;i<n;i++)
    {   cin>>k;cal.push_back(k);
    }
    sort(cal.begin(),cal.end());
    k=0;
    long long sum=0;
    for(int i=cal.size()-1;i>=0;i--)
    {   sum +=(long long)(pow(2,k))*(long long)(cal[i]);
        k++;
    }
    cout<<sum<<endl;
    
    return 0;
}