diff --git a/5.2.py b/5.2.py
new file mode 100644
index 0000000..3452d3e
--- /dev/null
+++ b/5.2.py
@@ -0,0 +1,30 @@
+class Rectangle:
+    def __init__(self, length , width):
+        self.length = length
+        self.width = width
+        
+    
+    def Perimeter(self):
+        return 2*(self.length + self.width)
+    
+    def Area(self):
+        return self.length*self.width   
+    
+    def display(self):
+        print("The length of rectangle is: ", self.length)
+        print("The width of rectangle is: ", self.width)
+        print("The perimeter of rectangle is: ", self.Perimeter())
+        print("The area of rectangle is: ", self.Area())
+class Parallelepipede(Rectangle):
+    def __init__(self, length, width , height):
+        Rectangle.__init__(self, length, width)
+        #super().__init__(length, width)
+        self.height = height
+        
+    def volume(self):
+        return self.length*self.width*self.height
+        
+myRectangle = Rectangle(7 , 5)
+myRectangle.display()
+myParallelepipede = Parallelepipede(7 , 5 , 2)
+print("the volume of myParallelepipede is: " , myParallelepipede.volume())
diff --git a/5.3.py b/5.3.py
new file mode 100644
index 0000000..ad0f509
--- /dev/null
+++ b/5.3.py
@@ -0,0 +1,25 @@
+class BankAccount: 
+    def __init__(self,accountNumber, name, balance):
+        self.accountNumber = accountNumber
+        self.name = name
+        self.balance = balance
+        
+    def Deposit(self , d ):
+        self.balance = self.balance + d
+    
+    def Withdrawal(self , w):
+        if(self.balance < w):
+            print("impossible operation! Insufficient balance !")
+        else:
+            self.balance = self.balance - w
+    
+    def bankFees(self):
+        self.balance = (95/100)*self.balance
+        
+    def display(self):
+        print("Account Number : " , self.accountNumber)
+        print("Account Name : " , self.name)
+        print("Account Balance : " , self.balance , " $")
+
+newAccount = BankAccount(2178514584, "Albert" , 2700)
+newAccount.display()
\ No newline at end of file
diff --git a/5.4.py b/5.4.py
new file mode 100644
index 0000000..806fb64
--- /dev/null
+++ b/5.4.py
@@ -0,0 +1,24 @@
+class Person:
+    def __init__(self, name, age):
+        self.name = name
+        self.age = age
+    
+    def display(self):
+        print("Person name : ", self.name)
+        print("Person age = ", self.age)
+    
+class Student(Person):
+    def __init__(self, name , age , section):
+        super().__init__(name, age)
+        self.section = section
+    
+    def displayStudent(self):
+        print("Student name : ", self.name)
+        print("Student age = ", self.age)
+        print("Student section = ", self.section)
+    
+P = Person("Tomas Wild", 37)
+P.display()
+
+S = Student("Albert", 23 , "Mathematics")
+S.displayStudent()
diff --git a/school.py b/school.py
new file mode 100644
index 0000000..e2a25cf
--- /dev/null
+++ b/school.py
@@ -0,0 +1,42 @@
+from unicodedata import name
+
+
+class School:
+
+    students = []
+
+    def __init__(self, capacity):
+        self.capacity = capacity
+
+    def add_student(self, student):
+        if len(self.students) < self.capacity:
+            self.students.append(student)
+        else:
+            print('School capacity is full. Cannot register:', student)
+
+    def print_students(self):
+        print(f"There are {len(self.students)} students. With following info:")
+        for s in self.students:
+            print(s)
+
+class Student:
+
+    def __init__(self, name, age, gender):
+        self.name = name
+        self.age = age
+        self.gender = gender
+
+    def __str__(self):
+        return "Student with name {} and gender {}".format(self.name, self.age)
+
+school = School(2)
+student_1 = Student("Eva", 21, "female")
+student_2 = Student("Jack", 18, "male")
+student_3 = Student("Anna", 18, "female")
+school.add_student(student_1)
+school.add_student(student_2)
+school.print_students()
+school.add_student(student_3)
+
+print(school.__dict__)
+print(student_1.__dict__)
\ No newline at end of file