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

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