#include <stdio.h>
int main()
{
  int year,leap;
  scanf("%d",&year);

  if(year%4!=0)
    leap=0;
  else if (year%100!=0)
    leap=1;
  else if(year%400!=0)
    leap=0;
  else
	  leap=1;
  if (leap)
     printf("%d is ",year);
  else
     printf("%d is not ",year);
  printf("a leap year.\n");
  return 0;
}