#include <iostream>
using namespace std;

int main() {
    int year;
    cin >> year;
    
    if (year < 1 || year > 1000000000) {
        cout <<"invalid input" << endl;
        return 0
    }
    
    if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
        cout << "leap year" << endl;
    } else{
        cout << "not a leap year" << endl;
    }
    
    return 0;
}