#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    int calories_i;
    cin >> n;
    int calories[n];
    for(calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
       // your code goes here
    for(int p=0;p<n;p++)
        for(int q=0;q<n-p;q++)
        {
        if(calories[q]<calories[q+1])
            {
            int temp=calories[q];
            calories[q]=calories[q+1];
            calories[q+1]=temp;
        }
    }
    
    int j=0,k=0,c;
    for(int i=0;i<n;i++)
        {
        c=calories[i];
        j=j+(c*(2^k));
        k++;
        }
    cout<<"value of miles :"<<j;
    return 0;
}