// No.394 ハーフパイプ(1)
// https://yukicoder.me/problems/no/394
//

#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <numeric>
using namespace std;

double solve(vector<int> &scores);


int main() {
    const int NUM_OF_JUDGE = 6;
    vector<int> scores(NUM_OF_JUDGE);
    for (auto i = 0; i < NUM_OF_JUDGE; i++) {
        cin >> scores[i];
    }
    double ans = solve(scores);
    cout << setprecision(2) << fixed << ans << endl;
}

double solve(vector<int> &scores) {
    sort(scores.begin(), scores.end());
    double total = accumulate(scores.begin()+1, scores.end()-1, 0.0);
    return total / (scores.size() - 2.0);
}