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