diff --git a/__pycache__/bank.cpython-39.pyc b/__pycache__/bank.cpython-39.pyc
new file mode 100644
index 0000000..a8f30d6
Binary files /dev/null and b/__pycache__/bank.cpython-39.pyc differ
diff --git a/__pycache__/client.cpython-39.pyc b/__pycache__/client.cpython-39.pyc
new file mode 100644
index 0000000..641b21c
Binary files /dev/null and b/__pycache__/client.cpython-39.pyc differ
diff --git a/bank.py b/bank.py
new file mode 100644
index 0000000..cf78b30
--- /dev/null
+++ b/bank.py
@@ -0,0 +1,20 @@
+'''**bank.py**
+
+- You will have class `Bank`. This bank will have instance variable `name` and class variable `clients` list. Initially this list will be empty.
+- This class will have method `add_client` method which appends the client to list
+- And lastly this class will have `authentication` method which takes `name` and `account_number` as parameters and authenticates the client'''
+from client import Client
+class Bank:
+    clients = []
+    def __init__(self, name):
+        self.name = name
+    def add_client(self, name):
+        self.clients.append(name)
+    def authentication(self, name, account_number):
+        if Client.account[str(account_number)]["name"] == name :
+            print("authentication is succesfull!")
+            return True
+        else :
+            print("Authentication failed! \nReason: Name not found.")
+            return False
+
diff --git a/client.py b/client.py
new file mode 100644
index 0000000..c17e7ac
--- /dev/null
+++ b/client.py
@@ -0,0 +1,33 @@
+'''**client.py**
+- You will have class `Client` inside this file.
+- Class `Client` will have `account_number`, `name`, `total_amount` attributes
+- `__init__` method will initialize these variables, it will take `name` and `total_amount` as params and will assign a random 5 digit int to `account_number`
+- Lastly this class will have `withdraw`, `deposit` and `balance` methods.
+'''
+import random
+class Client:
+    account={}
+    def __init__(self, name, total_amount):
+        self.name=name
+        self.total_amount=total_amount
+        self.account_number = random.randint(10000,99999)
+        print(f"Account created successfully! Your account number is: {self.account_number} ")
+        Client.account[str(self.account_number)] = {"name" : self.name , "total_amount" : self.total_amount}
+    '''def newaccount(self):
+        Client.account.update({str(self.account_number) : {"total_amount" : self.total_amount}})
+        print(f"Succesfull . Your new balance : {self.total_amount} ")'''
+    def withdraw(self, amount):
+        if self.total_amount > amount :
+            self.total_amount -= amount
+            print(f"\nThe sum of {amount} has been withdrawn from your account balance")
+            print(f"Your current account balance is: {self.total_amount}")
+            return self.total_amount
+        else:
+            return "Insufficient funds"
+    def deposit(self, amount):
+        self.total_amount+= amount
+        print(f"The sum of {amount} has been added to your account balance.")
+        print(f"Your current account balance is: {self.total_amount}")
+        return self.total_amount
+    def balance(self):
+        print ("Your current account balance is: {self.total_amount}") 
\ No newline at end of file
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..3fbe34e
--- /dev/null
+++ b/main.py
@@ -0,0 +1,131 @@
+'''**main.py**
+- This class initially will create a bank object with a name you choose and then will print the following menu (it should print this menu, until user says exit) [**hint:** use while loop]:
+```
+Welcome to International Bank!
+
+Choose an option:
+
+    1. Open new bank account
+    2. Open existing bank account
+    3. Exit
+```
+Then it will take the user input: 
+- If it is 1, create an account
+First ask the name and then the deposit amount to user:
+```
+To create an account, please fill in the information below.
+Name: 
+Deposit amount: 
+```
+After this, it creates the account and prints the menu again
+```
+Account created successfully! Your account number is:  88194
+
+Choose an option:
+
+    1. Open new bank account
+    2. Open existing bank account
+    3. Exit
+```
+- If it is 2, asks following info
+```
+To access your account, please enter your credentials below.
+Name:
+Account Number:
+```
+First asks name and then account number. 
+If credentials are wrong, print following, and then print the menu again:
+```
+Authentication failed!
+Reason: account not found.
+```
+If credentials are correct, prints the following menu:
+```
+Authentication successful!
+
+Welcome irem!
+
+Choose an option:
+
+    1. Withdraw
+    2. Deposit
+    3. Balance
+    4. Exit
+```
+And according to user input you can withdraw, deposit money. Or see the current balance. 
+If input is 1, asks for withdraw amount:
+```
+Withdraw amount:
+```
+And according to user input witdraws the amout and prints the menu again.
+```
+The sum of 100 has been withdrawn from your account balance.
+
+Your current account balance is: 900
+```
+If input is 2, asks for deposit amount:
+```
+Deposit amount:
+```
+And according to user input, in this case 300. Prints following:
+```
+
+The sum of 300 has been added to your account balance.
+
+Your current account balance is: 1200
+```
+
+If input is 3, shows the current balance:
+
+```
+Your current account balance is: 1200
+
+```
+If input is 4, it goes back to other menu.
+
+- And lastly, in the main menu, if user input is 3: close the program'''
+
+from client import Client
+from bank import Bank
+
+international_bank = Bank("International")
+while True:
+    choice = input("Welcome to International Bank!\nChoose an option:\n1. Open new bank accountn\n2. Open existing bank accountn\n3. Exit")
+    if (choice == "1"):
+        print("To create an account, please fill in the information below.\nName\nDeposit amount:")
+        name =input("Name:")
+        total_amount=int(input("Deposit amount:"))
+        client = Client(name, total_amount)
+        international_bank.add_client(client)
+    elif (choice == "2"):
+        print("To access your account, please enter your credentials below.")
+        name =input("Name:")
+        account_number = int(input("Account Number:"))
+        '''if not international_bank.authentication(name, account_number=):
+            print("Authentication failed!\nReason: account not found.")'''
+        if international_bank.authentication(name, account_number) :
+            print("Authentication successful!\nWelcome {name}!")
+            choice1 = input("Choose an option:\n1. Withdraw\n2. Deposit\n3. Balance\n4. Exit")
+            if choice1 == "1":
+                withdraw = int(input("Withdraw amount:"))
+                for i in Bank.clients:
+                    if i.name == name and i.account_number == account_number :
+                        i.withdraw(withdraw)
+            elif choice1=="2":
+                Deposit_amount:int(input("Deposit amount:"))
+                for i in Bank.clients:
+                    if i.name == name and i.account_number == account_number : 
+                        i.deposit(Deposit_amount)
+                print("The sum of {Deposit_amount} has been added to your account balance\nYour current account balance is: {Deposit_amount} + {balance}")
+            elif choice1=="3":
+                for i in Bank.clients:
+                    if i.name == name and i.account_number == account_number : 
+                        print(i.balance())
+            elif choice1=="4":
+                break
+            else : 
+                print("Error")
+    elif choice == "3" :
+        break
+    else:
+        print("error")