int main()
{
  int year,leap;
  scanf("%d",&year);
  if ((year%4==0 && year%100!==0) || (year%400==0))
      leap=1;
      else
      leap=0;
      if (leap)
          printf("%dis",year);
      else
          printf("%dis not",year);
      printf("a leap year\n");
  return 0;
}