#include <iostream>
using namespace std;

class Stud
{
    int m1, m2, m3;
public:
    Stud()
    {
        m1 = 70;
        m2 = 80;
        m3 = 90;
    }
    friend void avg(Stud s);
};

void avg(Stud s)
{
    cout << "Average: " << (s.m1 + s.m2 + s.m3) / 3 << endl;
}

int main()
{
    Stud s;
    avg(s);
    return 0;
}