import java.util.*;
class GregorianCalendarExam
{
 public static void main(String [] args)
 {
  GregorianCalendar gca1=new GregorianCalendar();
  long mm=gca1.getTimeInMillis();
  int count=0;
  for(int i=2000;i<=2050;i++)
  {
  	if(gca1.isLeapYear(i))
  	{
  	  System.out.print(i+" ");
  	  count++;
  	}
  }	
  System.out.println("\n 總共有"+count+"個閏年");
  System.out.println(" 運行時間"+(System.currentTimeMillis()-mm)+"毫秒");
 }
}