bool leapYear(int n)
{
    if(n%100==0){
        if(n%4==0 && n%400==0)
            return true;
        else return false;}
    else
    {
        if(n%4==0)
            return true;
        else return false;
    }
}
int main()
{
    int n;
    cout<<"N:";cin>>n;
    if(leapYear(n)==true)
        cout<<"Nam Nhuan";
    else
        cout<<"Khong phai nam nhuan";
}