#include <iostream>
using namespace std;
int main()
{int year;
bool leap;
cout <<"please enter year:";
cin >> year;
if(year%4==0)

{
if(year%100==0)
{
if(year%400==0)
      

         leap=true;

               else leap=false;

}
else
leap=true;}
else
  leap=false;

if(leap)
cout << year << "is";
else
   cout << year << "is not";
cout << "a leap year." << endl;
return 0;

}