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


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