#include <stdio.h>
int main()
{
  int year,leap;
  scanf("%d",&year);
  if (year%4==0)
  {
    if(year%100==0)
	{
      if(year%400==0)
         leap=1;
      else
         leap=0;
	}
    else
      leap=1;
  }
  else
    leap=0;
  if (leap)
     printf("%d is ",year);
  else
     printf("%d is not ",year);
  printf("a leap year.\n");
  return 0;
}