#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 int n,i,j=0,ans=0,z;
    cin>>n;
    vector<long int>a(n);
    for(i=0;i<n;i++)
    {
      cin>>a[i];  
    }
    sort(a.begin(),a.end());
    for(i=n-1;i>=0;i--)
    {
        z = pow(2,j);
        ans = ans + (a[i]*z);
        j++;
    }
    cout<<ans<<endl;
    return 0;
}