#include using namespace std; using ll = long long; using VI = vector; using VL = vector; using PII = std::pair; using PLL = std::pair; #define rep(i, n) for (int i = 0; i < (int)(n); i++) #define rep2(i, s, n) for (int i = (s); i < (int)(n); i++) #define allpt(v) (v).begin(), (v).end() #define allpt_r(v) (v).rbegin(), (v).rend() const int mod = 1e9 + 7; const string wsp = " "; const string tb = "\t"; const string rt = "\n"; template void show1dvec(vector v) { int n = v.size() - 1; rep(i, n) cout << v[i] << wsp; cout << v[n] << rt; return; } int main() { #ifdef DEBUG cout << "DEBUG MODE" << endl; ifstream in("input.txt"); //for debug cin.rdbuf(in.rdbuf()); //for debug #endif vector v(6); rep(i, 6) cin >> v[i]; sort(allpt(v)); printf("%.2f\n", (v[1] + v[2] + v[3] + v[4]) / 4); return 0; }