#include<stdio.h>

void main()
{
    int y=2000;
    while(y<=2500)
    {
        //scanf("%d",&y);
        if(y%4!=0)
      {
           printf("%d不是闰年\n",y);
       }
       else if(y%4==0&&y%100!=0)printf("%d是闰年\n",y);
       else if(y%100==0&&y%400==0)
        {
            printf("%d是闰年\n",y); 
        }
        else
        {
            printf("%d不是闰年\n",y);
        }
        y++;
    }
    return;
}