#include<iostream>

using namespace std;

bool checkLeapYear(int year){
   if(year<0){
      return false;
   }
   else if(year % 400 == 0){
      return true;
   }
   else if(year % 100 == 0){
      return false;
   }
   else if(year % 4 == 0){
      return true;
   }
   return false;
}

int main() {
   int inputYear;
   cin>>inputYear;
   if(checkLeapYear(inputYear)){
      cout<<inputYear<<" is a leap year."<<endl;
   }
   else{
      cout<<inputYear<<" is not a leap year."<<endl;
   }

   return 0;
}