#include<bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
     int x;vector<int>v;
    for(int i=0;i<n;i++)
        {
        cin>>x;
        v.push_back(x);
        
    }
    sort(v.rbegin(),v.rend());long long int s=0;int y;
    for(int i=0;i<v.size();i++)
        {
        s+=(v[i]*pow(2,i));
    }
    cout<<s<<"\n";
    return 0;
}