#include <iostream>
#include<iomanip>
using namespace std;
double mx(int a, int b) {
    if (a > b)return a;
    else return b;
}
double mn(int c, int d) {
    if (c < d)return c;
    else return d;
}

int main() {
    double a, b, c, d, e, f, g;
    double avg;
    double max, min;
    while (cin >> a >> b >> c >> d >> e >> f >> g) {
        max = mx(a, b);
        max = mx(max, c);
        max = mx(max, d);
        max = mx(max, e);
        max = mx(max, f);
        max = mx(max, g);
        min = mn(a, b);
        min = mn(min, c);
        min = mn(min, d);
        min = mn(min, e);
        min = mn(min, f);
        min = mn(min, g);
        avg = (a + b + c + d + e + f + g - max - min) / 5;
        cout << setiosflags(ios::fixed) << setprecision(2);
        cout << avg << endl;
    }
}
// 64 位输出请用 printf("%lld")