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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    ll N;
    cin>>N;
    ll a[N+3];
    for(int i=0;i<N;i++)
        cin>>a[i];
    sort(a,a+N);
    reverse(a,a+N);
    ll sum=0;
    for(int i=0;i<N;i++)
        {
        sum=sum+(pow(2,i)*a[i]);
    }
    cout<<sum<<'\n';
    return 0;
}