#include <iostream>
#include <cstdlib>
#include <ctime>    //for the functions time and localtime
using namespace std;

int main()
{
        //Get the current hour of the day (0 to 23 inclusive).
        time_t t {time(nullptr)};
        tm *p {localtime(&t)};
        int hour {p->tm_hour};

//	if (hour >= 12) {
//		if (hour < 12 + 9) {
//			if (hour < 12 + 5) {
//				cout << "Good afternoon.";
//			} else {
//				cout << "Good evening.";
//			}
//		} else {
//			cout << "Good night.";
//		}
//	} else {
//		cout << "Good morning.";
//	}

	if (hour >= 21) {                     // same as 12 + 9 (or 9 pm)
		cout << "Good night.";
	}
	else if (hour >= 17) {                // same as 12 + 5 (or 5 pm)
		cout << "Good evening.";
	}
	else if (hour >= 12) {                // 12 pm
		cout << "Good afternoon.";
	}
	else {                                // anytime before noon
		cout << "Good morning.";
	}


	cout << "\n";
        return EXIT_SUCCESS;
}