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#include <iostream>
using namespace std;
int yourKoresh(int age) {
	/*int key=0;
	if (age > 10) {
		key = 1;
	}
	if (age > 20) {
		key = 2;
	}
	if (age > 30) {
		key = 3;
	}
	if (age > 40) {
		key = 4;
	}
	switch (key) {
	case 1: cout << "moldoy";
		break;
	case 2: cout << "bivaliy";
		break;
	case 3: cout << "starche";
		break;
	case 4: cout << "ne bivaet";
		break;
	default: cout << "perec";
	}
} */
	switch (age) {
	case 10 ... 20: 
		cout << "moldoy";
		break;
	case 20 ... 30: 
		cout << "bivaliy";
		break;
	case 30 ... 40:
		cout << "starche";
		break;
	case 40 ... 100: cout << "ne bivaet";
		break;
	default: cout << "perec";
	}
}





int main()
{
	int age;
	cin >> age;
	yourKoresh(age);
}