#include <iostream>
  
bool isLeapYear(int year);
  
int main()
{
    int input;
    std::cout << "Enter a year: ";
    std::cin >> input;
    if (isLeapYear(input))
    {
        std::cout << input << " is a leap year\n";
    }
    else
    {
        std::cout << input << " is not a leap year\n";
    }
  
    return 0;
}
  
bool isLeapYear(int year)
{
    if (year % 4 == 0)
    {
        if (year % 100 == 0)
        {
            if (year % 400 == 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        else
        {
            return true;
        }
    }
    else
    {
        return false;
    }
}