#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<map>
#include<math.h>
#include<iomanip>
#include<set>
#include<numeric>
#include<cstring>
#include<cstdio>
#include<functional>
#include<bitset>
#include<limits.h>
#include<cassert>
#include<iterator>
#include<complex>
#include<stack>
using namespace std;
#define lint long long int
/*
vector<char>al(26);
al = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
vector<char>AL(26);
AL = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
*/

int main() {
	vector<double>vec(6);
	for (int i = 0; i < 6; i++) {
		cin >> vec.at(i);
	}
	sort(vec.begin(), vec.end());
	double sum = 0;
	for (int i = 1; i < 5; i++) {
		sum += vec.at(i);
	}
	sum /= 4;
	if (sum < 10) {
		cout << setprecision(3) << sum << endl;
	}
	else if (sum < 100) {
		cout << setprecision(4) << sum << endl;
	}
	else {
		cout << setprecision(5) << sum << endl;
	}
}