class Person:
    count_instance = 0
    def __init__(self,first_name,last_name,age):
        print('Hello')
        Person.count_instance +=1
        self.first_name = first_name
        self.last_name = last_name
        self.age= age


p1 = Person('raj','gautam',23)
p2 = Person('raj','gautam',23)
p3 = Person('raj','gautam',23)



print(Person.count_instance)
