#include <bits/stdc++.h>

using namespace std;

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