import java.io.*;
public class testinput
{
     public static void main(String args[]) throws IOException
     {
       int year;
       InputStreamReader ir;
       BufferedReader in;
       ir=new InputStreamReader(System.in);
       in=new BufferedReader(ir);
       System.out.println("輸入一個年份: ");
       String s=in.readLine();
       year=Integer.parseInt(s);
       
       if(((year%4==0)&&(year%100!=0))||(year%400==0))
          System.out.println(year +" 年是一個閏年.");
       else
          System.out.println(year +" 年不是一個閏年.");
     }
}