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