#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define pb push_back
#define int long long
#define fi first
#define se second
const int N = 3e5 + 5, M = 1e9 + 7, LG = 20;
int n , A[N] , x;
void solve(){
cin >> n;
vector<int> s;
for (int i=1 ; i<=n ; i++){
cin >> x;
s.pb(x);
}
sort(s.rbegin() , s.rend());
int ans = 0;
for (int i=0 ; i<n ; i++){
if (i%3 != 2){
ans += s[i];
}
}
cout << ans << endl;
}
signed main(){
// freopen("" , "r" , stdin);
// freopen("" , "w" , stdout);
// cout << setprecision(30);
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int ts = 1;
// cin >> ts;
while(ts--){
solve();
}
}
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