#include<iostream>
using namespace std;

int main() {
    int N;
    cout << "Nhap so hoc sinh: ";
    cin >> N;

    int diem[N], tong = 0, dau = 0, rot = 0;

    for(int i = 0; i < N; i++) {
        cout << "Nhap diem thu " << i+1 << ": ";
        cin >> diem[i];
        tong += diem[i];
        if(diem[i] >= 5) dau++;
        else rot++;
    }

    float diemTB = (float)tong / N;
    cout << "Diem trung binh: " << diemTB << endl;
    cout << "So hoc sinh dau la: " << dau << endl;
    cout << "So hoc sinh truot la: " << rot << endl;

    return 0;
}