/**

  This program determines whether or not a year is a leap year.

*/

import java.util.Scanner;

public class LeapYear {

  public static void main( String[] args ) {

     // Get the year.
     Scanner inp = new Scanner(System.in);
     System.out.print("Enter the year: ");
     int year = inp.nextInt();
     if( year < 1582 ) {
       System.out.println( "The year can't be earlier than 1582." );
       System.out.println( "The year " + year + " is not a valid year." );
       System.exit(0);
     }

     // Determine whether or not a year is a leap year.
     boolean isLeapYear;
     if( year % 100 == 0 ) {
       if( year % 400 == 0 ) {
         isLeapYear = true;
       }
       else {
         isLeapYear = false;
       }
      }
      else {
       if( year % 4 == 0 ) {
         isLeapYear = true;
       }
       else {
         isLeapYear = false;
       }
      }

      // Display the answer
      if( isLeapYear ) {
        System.out.println( year + " is a leap year." );
      }
      else {
        System.out.println( year + " is not a leap year." );
      }

  }
}