#include "bits/stdc++.h" using namespace std; #define intt long long #define fi first #define se second const intt mxN = 1e5 + 5; const intt LG = 20; const intt inf = 1e18; intt n; vector<intt> a(mxN); void _() { cin >> n; intt s = 0; for(intt i = 0; i < n; i++) { cin >> a[i]; s += a[i]; } if(n <= 2) { cout << s << endl; return; } sort(a.begin(), a.end()); reverse(a.begin(), a.end()); intt c = 0; for(intt i = 2; i < n; i += 3) { c += a[i]; if(i + 3 > n - 1) { break; } } cout << s - c << endl; } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); intt t = 1, buu = 1; // cin >> t; while(t--){ // cout << "Case #" << buu++ << ": "; _(); } }