#include <bits/stdc++.h>

using namespace std;

int main(){
    long long int n,i,sum=0,j=0;
    cin >> n;
    long long int calories[n];
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    sort(calories,calories+n);
    for(i=n-1;i>=0;i--)
     {
        sum+=calories[i]*pow(2,j);
        j++;
    }
    cout<<sum<<endl;
    // your code goes here
    return 0;
}