#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    // your code goes here
    int miles=0;
    for(int i=0;i<n;i++)
    {
        for(int j=i;j<n;j++)
        {
            if(calories[i]>calories[j])
            {
                int temp;
                temp=calories[j];
                calories[j]=calories[i];
                calories[i]=temp;
            }
        }
        miles+=calories[i]*2^i;
    }
    cout<<miles;
    return 0;
}