import java.util.*;
import java.io.*;

public class LeapYear{
	public static void main(String[] args) throws IOException{
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		System.out.print("Enter year to check for leap year : ");
		int year;
		try{
			year = Integer.parseInt(in.readLine());
			if(year < 1900 || year > 2100){
				System.out.print("Please enter a year less than 2101 and greater than 1899.");
				System.exit(0);
			}
			GregorianCalendar cal = new GregorianCalendar();
			if(cal.isLeapYear(year))
				System.out.print("Given year is leap year.");
			else
				System.out.print("Given year is not leap year.");
		}
		catch(NumberFormatException ne){
			System.out.print(ne.getMessage() + " is not a legal entry.");
			System.out.println("Please enter a 4-digit number.");
			System.exit(0);
		}
	}
}