#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main() 
{
    ll n,m,i,j,k,s=0;
    cin>>n;
    ll a[n];
    for(i=0;i<n;i++)
    {
        cin>>a[i];
    }
    sort(a,a+n);
    j=0;
    for(i=n-1;i>=0;i--)
    {
        s=s+a[i]*pow(2,(j));
        j++;
    }
    cout<<s<<"\n";
	return 0;
}