#include <stdio.h>
int main(void) {
    int year,leap = 0;  //初始值为假，不是闰年
    scanf("%d",&year);
    if(((year%4==0)&&(year%100!=0))||(year%400==0))
      leap = 1;
    if(leap == 0)
      printf("%d不是闰年",year);
    if(leap == 1)
      printf("%d是闰年",year);
    return 0;
}