#include <iostream>
#include <algorithm>
using namespace std;

bool compare(unsigned int a,unsigned int b)
    {
    if(a>b)
        return true;
    return false;
}

int main() {
    unsigned int n;
    cin>>n;
    unsigned int a[n],i;
    unsigned long int ans=0,pow=1;
    for(i=0;i<n;i++)
        {
        cin>>a[i];
    }
    sort(a,a+n,compare);
    for(i=0;i<n;i++)
        {
        ans=ans+pow*a[i];
        pow=pow*2;
    }
    cout<<ans;
    return 0;
    
}