#include <iostream>
#include <vector>
#include <iomanip>


using namespace std;

int main()
{
    std::vector <int> ocjene;

    int ocjena;
    cout << "Unesi ocjenu: " << endl;
    cin >> ocjena;

    while(ocjena == 6 || ocjena == 7 || ocjena == 8 || ocjena == 9 || ocjena == 10){
        ocjene.push_back(ocjena);

        cout << "Unesi  ocjenu: " << endl;

        cin >> ocjena;
    }

    int suma = 0;
    for(int i = 0; i < ocjene.size(); i++) {
        suma += ocjene[i];
    }

    float prosjek = (float) suma / ocjene.size();

    cout << "Prosjek ocjena je: " << setprecision(2) << fixed << prosjek;

    return 0;
}