#include "bits/stdc++.h"
using namespace std;
const int N = 50;
int n;
int arr[N];
long long ans;
int main(){
    cin >> n;
    for(int i = 0 ; i < n ; ++i){
        cin >> arr[i];
    }
    sort(arr , arr + n);
    reverse(arr , arr + n);
    ans = 0;
    for(int i = 0 ; i < n ; ++i){
        ans += (1LL << i) * arr[i];
    }
    printf("%lld\n" , ans);
}