//No.394 ハーフパイプ(1)
#include<iostream>
#include<vector>
#include<iomanip>
using namespace std;

int main()
{
	vector<int> S;
	double tmp_d;
	for (int i = 0; i< 6; i++) {
		cin >> tmp_d;
		S.push_back(tmp_d);
	}

	//find max
	int tmp_max = 0;
	for (int i = 0; i < S.size(); i++) {
		if (S[i] > tmp_max)tmp_max=S[i];
	}
	//erase max
	for (int i = 0; i < S.size(); i++) {
		if (S[i] == tmp_max) {
			S.erase(S.begin()+i);
			break;
		}
	}

	//find min
	int tmp_min = 100;
	for (int i = 0; i < S.size(); i++) {
		if (S[i] < tmp_min)tmp_min = S[i];
	}
	//erase min
	for (int i = 0; i < S.size(); i++) {
		if (S[i] == tmp_min) {
			S.erase(S.begin() + i);
			break;
		}
	}

	double ave=0.0;
	for (int i = 0; i < S.size(); i++) {
		ave += S[i];
	}
	ave /= S.size();
	cout << fixed << setprecision(2) << ave << endl;
	return 0;
}