#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 long int n;
    cin>>n;
   long long int a[n];
    for(long long int i=0;i<n;i++)
        {
        cin>>a[i];
    }
    sort(a,a+n);
   long long int c=0;
    for(long long int i=n-1,j=0;i>=0;i--,j++)
        {
        c=c+(pow(2,j)*a[i]);
    }
    cout<<c;
    return 0;
}