0. [H] Write an algorithm [ Python ] for a program which figures out whether a given year is a leap year. In the Gregorian calendar (our current calendar) three criteria must be taken into account to identify leap years:

   1. The year can be evenly divided by 4, and

   2. If the year can be evenly divided by 100, it is NOT a leap year, unless;

   3. The year is also evenly divisible by 400. Then it is a leap year.