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