#include <iostream> #include <algorithm> #include <string> #include <vector> #include <map> #include <set> #include <stdio.h> #include <cstring> #include <queue> #include <stack> #include <functional> #include <math.h> #include <iomanip> using namespace std; #define Would #define you const int INF = 999999999; const int MOD = 1e9 + 7; int main() { int k[10]; for (int i = 0; i < 6; ++i) { cin >> k[i]; } sort(k, k + 6); printf("%.2f\n", (double)(k[1] + k[2] + k[3] + k[4]) / 4); }