#include <iostream>
#include <string>
using namespace std;

struct Person {
    string name;
    int age;
};

struct Student : public Person {
    int score[3];
    double average;

    void calcAverage() {
        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += score[i];
        }
        average = sum / 3.0;
    }
};

int main() {
    Student s;

    cin >> s.name;
    cin >> s.age;
    for (int i = 0; i < 3; i++) {
        cin >> s.score[i];
    }

    s.calcAverage();
    cout << "평균: " << s.average << endl;

    return 0;
}