diff --git a/bank.py b/bank.py
new file mode 100644
index 0000000..a959e97
--- /dev/null
+++ b/bank.py
@@ -0,0 +1,20 @@
+class Bank: #I defined class Bank.  
+    clients=[] #clients list and it is now empty
+    def __init__(self,name): #This bank will have instance variable name and class variable clients list.
+        self.name=name
+        
+    
+    def add_client(self,client):#Class have method add_client method which appends the client to list
+        self.clients.append(client)
+
+    def authentication(self,name,account_number):#authentication method which takes name and account_number as parameters a
+    #and authenticates the client
+        self.name=name
+        self.account_number=account_number
+        
+        for i in range(len(self.clients)):
+            client=self.clients[i]
+          
+            if (name==client.account["name"]) and (account_number==client.account["account_number"]):
+                print("Authentication is succesful")
+                return self.clients[i]
\ No newline at end of file
diff --git a/client.py b/client.py
new file mode 100644
index 0000000..87ec92b
--- /dev/null
+++ b/client.py
@@ -0,0 +1,35 @@
+from random import randint
+
+class Client:#I defined a class Client
+    account={}
+    
+    def __init__(self,name,total_amount):#Class Client have account_number, name, total_amount attributes
+       
+        self.account["name"]=name
+        self.account["balance"]=total_amount
+        self.account["account_number"]=randint(10000,99999)# assign a random 5 digit int to account_number
+
+    def withdraw(self,amount): #withdraw, deposit and balance methods.
+        
+        self.account["balance"] -=amount
+        print(f"the sum of {amount} has been withdrawn from your account balance")
+        
+        self.balance()
+
+   
+
+
+    def deposit(self,amount):
+        
+        
+        self.account["balance"] += amount
+        print(f"the sum of {amount} has been added to your account balance")
+        self.balance()
+
+   
+    
+    
+    def balance(self):
+        print("Your current account balance is: {} ".format(self.account["balance"]))
+
+        
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..41a0723
--- /dev/null
+++ b/main.py
@@ -0,0 +1,67 @@
+from client import Client  #Client and Bank Classes are imported.
+from bank import Bank
+
+bank=Bank("Asya") # i give a bank name to my bank object
+print(f"Welcome to International {bank.name} Bank")
+
+while True: # I used while to return the code until user press 3 button
+    print("""Choose an option:
+
+    1. Open new bank account
+    2. Open existing bank account
+    3. Exit""")
+
+    choice=int(input("1,2,3 : "))
+    if choice==1: #If choice is one i crreated a new client
+        print("To create an account, please fill in the information below.")
+        client=Client(input("Name: "),float(input("Deposit amount: ")))
+        bank.add_client(client)
+        client_account=client.account["account_number"]
+        print(f"Account created succesfully. Your account number is {client_account}")
+
+    elif choice==2: # if choise is 2 . The name and bank account are controlled if they are true.
+        try:
+            print("To access your account, please enter your credentials below.")
+            name=input("name: ")
+            account_number=int(input("enter your account number:"))
+        except Exception:
+            print("""Authentication failed! 
+            Reason: account not found""" )
+
+        current_client=bank.authentication(name,account_number)
+        if current_client:  # If they are true the code continues with the other section
+            print("Welcome {}!".format(current_client.account["name"]))
+
+        
+            while True: # I used again while loop
+                print("""Choose an option:
+
+    1. Withdraw
+    2. Deposit
+    3. Balance
+    4. Exit""")
+                choice2=int(input("1,2,3,4 : "))
+                if choice2==1: # if choice2 is 1 , I calculated the balance with the withdraw method.
+                    
+                    
+                        withdraw=int(input("Withdraw amount: "))
+
+                        current_client.withdraw(withdraw)
+                        
+                elif choice2==2: # If the choice2 is 2 < i calculated the balance with the deposit method.
+                    deposit=int(input("Deposit amount: "))
+                    current_client.deposit(deposit)
+                    
+                elif choice2==3:  #If choice2 is 3 , The balance is showed by the user
+                    current_client.balance()
+                
+                
+                elif choice2==4: # If the choice2 , the loop will be finished. And will turn the main menu.
+                    break
+    elif choice==3: #If the user press 3 the program will be finished.
+        print("Thank you very much to be a client of us. Have a nice day")
+        break
+
+        
+
+