#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define f1 first
#define s2 second
#define pb push_back
#define mp make_pair
#define ll long long
#define fri(a) freopen(a,"r",stdin);
#define fro(a) freopen(a,"w",stdout);
const int N=405;
int n,a,ans;
vector<int>v;
int main(){
//fri("in.txt");
//fro("out.txt");
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin>>n;
for(int i=0;i<n;i++){
cin>>a;
v.pb(a);
}
sort(v.begin(),v.end());
reverse(v.begin(),v.end());
for(int i=0;i<n-n%3;i+=3){
ans+=v[i]+v[i+1];
}
for(int i=n-n%3;i<n;i++){
ans+=v[i];
}
cout<<ans<<endl;
return 0;
}
