#include <stdio.h>

int main(void) {
	// your code goes here 
    int year;
    scanf("%d",&year);
    if((year%4==0)&&(year%100!=0)||(year%400==0))
    {
    printf("是闰年\n");
    }
    else{
    printf("不是闰年\n");
    }
	return 0;
}