#include <bits/stdc++.h> #define F first #define S second #define PB push_back #define MP make_pair #define dbg(x) cerr << #x << " = " << x << "\n" #define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie() using namespace std; using ll = long long; using ld = long double; const int N = int(1e5) + 500; int n, a[N]; ll ans = 0; int main() { fast_io; cin >> n; for (int i = 0; i < n; ++i) cin >> a[i]; sort(a, a + n); reverse(a, a + n); for (int i = 0; i < n; i += 3) for (int j = i; j < min(n, i + 2); ++j) ans += a[j]; cout << ans << "\n"; }