#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,c=0;
    cin>>n;
    long sum=0;
    int arr[n]={0};
    for(int i=0;i<n;i++)
        {
        cin>>arr[i];
    }
    sort(arr,arr+n);
    for(int i=n-1;i>=0;i--)
        {
        sum+= pow(2,c)*arr[i];
        c++;
    }
    cout<<sum;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}