import java.util.Scanner;

public class Task4{
	
	public static void main(String[] args){
		
		Scanner input = new Scanner(System.in);
		int year;
		do{
		System.out.println("Enter a year: ");
		year = input.nextInt();
		}while(year < 500);	

		if(year % 100 == 0){
			if(year % 400 == 0 && year % 4 == 0){
				System.out.println("It is a century leap year! ");
			}else{
				System.out.println("It is not a leap year! ");
			}
		}
		    else if(year % 4 == 0){
				System.out.println("It is a leap year! ");
			}
			else{
				System.out.println("It is not a leap year! ");
			}
		}	
		
	}
	
}