#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 ; cin >> n ;
    vector< long long int > v(n) ;
    for( int i=0 ;i<n ;i++) cin >> v[i] ;
    sort(v.rbegin(),v.rend()) ;
    long long int ans=0 ;
    long long int y=1 ;
    for( int i=0 ; i<n ; i++){
        ans += (v[i]* (y<<i) );
    }
    cout<<ans<<endl;
    return 0;
}