#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define LL long long 

using namespace std;


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