diff --git a/__init__.py b/__init__.py
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diff --git a/__pycache__/bank.cpython-39.pyc b/__pycache__/bank.cpython-39.pyc
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diff --git a/__pycache__/client.cpython-39.pyc b/__pycache__/client.cpython-39.pyc
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diff --git a/bank.py b/bank.py
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+++ b/bank.py
@@ -0,0 +1,19 @@
+
+class Bank:
+    clients = []
+
+    def __init__(self,name):
+        self.name = name
+    
+    def add_client(self,client):
+        self.clients.append(client) 
+
+    def authentication(self,name,account_number):
+        for i in range(len(self.clients)):
+            if name == self.clients[i]['name']and account_number == self.clients[i]['account number']:
+                print("Authentication is successful!")
+                return self.clients[i]
+
+# c = Bank('Halit')
+# c.add_client()
+# print(c.clients)
diff --git a/client.py b/client.py
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--- /dev/null
+++ b/client.py
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+import random
+class Client:
+    i=0
+
+    def __init__(self,name,total_amount,account_number = random.randint(10000,99999)):
+        self.name = name
+        self.account_number = account_number
+        self.total_amount = total_amount
+        Client.i+=1
+    
+    def withdraw(self):
+        amount = int(input('Enter an amount:'))
+        if amount<= self.total_amount and amount>0:
+            return f"You have withdrawn {amount}"
+        else:
+            return f"Invalid request"
+    
+    def deposit(self):
+        amount = int(input('Enter an amount:'))
+        if amount >0:
+            return f"You have {self.total_amount + amount} in your account."
+        else:
+            return f"You havent deposited any money."
+
+    def balance(self):
+        return f"Your balance is: {self.total_amount}"
+
+# client_1 =Client('halit',10000)
+# print(client_1)
\ No newline at end of file
diff --git a/main.py b/main.py
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--- /dev/null
+++ b/main.py
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+from bank import Bank
+from client import Client
+class Main(Bank):
+    b=Bank('Rabobank')
+    while True:
+        print('Welcome to {}','\n','\n','Choose an option:','\n','1.Open a new bank account','\n','2.Open an existing bank account','\n','3.Exit'.format(b))
+        number = int(input('Choose an option:'))
+        if number== 3:
+            break
+        elif number == 1:
+            print('To create an account please fill in the information below')
+            name= input('Enter your name:')
+            total_amount = int(input('Enter a deposit amount:'))
+            client_1= Client(name,total_amount)
+            b.add_client(client_1)
+            print('Account created successfully!Your account number is:{}'.format(client_1.account_number))
+            #print('Choose an option:','\n','1.Open a new bank account','\n','2.Open an existing bank account','\n','3.Exit')
+        elif number == 2:
+            print('To access your account, please enter your credentials below','\n')
+            name = input('Enter your name:')
+            account_number = int(input('Enter your account number:'))
+            c_authentication= b.authentication(name,account_number)
+            if c_authentication:
+                print('Welcome{}',format(client_1.name))
+                for i in range(len(b.clients)):
+                    if b.clients[i]['account_number']== account_number:
+                        break
+                while True:
+                    print("""Choose an option:
+                    1.Withdraw
+                    2.Deposit
+                    3.Balance
+                    4.Exit""")
+                    number1=input('Enter a number:')
+                    if number == 1:
+                        client_1.withdraw()
+                    elif number == 2:
+                        client_1.deposit()
+                    elif number == 3:
+                        client_1.balance()
+                    else:
+                        break
+            else:
+                print('Authentication failed!','\n','Reason: account is not found')
+                    
+
+            
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