#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
long pow(long a,long b){
    long ans=1;
    for(int i=0;i<b;i++)
        ans=ans*a;
    return ans;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
  
    long n;
    cin>>n;
      vector<int> v(n);
    for(int i=0;i<n;i++)
        cin>>v[i];
    sort(v.begin(),v.end());
    long miles=0,count=0;
    for(int i=n-1;i>=0;i--)
    miles+=v[i]*pow(2,count++);
    cout<<miles;
    return 0;
}