#include<iostream>
using namespace std;
int main()
{
    long long year;
    cin>>year;
    if(year<1||year>1000000000)
    {
      cout<<"invalid input";
    }
    else if ((year%4==0&&year% 100!=0)||(year%400==0))
    {
        cout<<"Not a leap year";
    }
    return 0;
    }
}