Який результат буде виведено на консоль?

class Students:
    _num = 0
    def __init__(self, firstname, lastname):
        self._firstname = firstname
        self._lastname = lastname
        Students._num += 1
    def stud_number(self):
        print(Students._num)
a = Students("Robert","Spunch")
a._num = 0
a.stud_number()