#include <iostream> #include <algorithm> #include <string> #include <cstdio> using namespace std; int main() { int s[6]; for (auto& x : s) cin >> x; sort (s, s + 6); int sum = 0; for (int i = 1; i < 5; i++) sum += s[i]; printf("%.2f\n", sum / 4.0); return 0; }