diff --git a/README.md b/README.md
index 44540b9..20239d6 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,318 @@
-### تمرین سری پنجم
+#Address
+import java.util.Scanner;
 
-### با توجه به توضیحات موجود در فولدر first کلاسهای مربوطه را پیاده سازی کرده و به کمک مثال مطرح شده کد خود را تست کنید.
+class Address {
+    private double latitude;
+    private double longitude;
+    private String written_address;
 
-### ضروری است ابتدا ریپازیتوری را فورک کنید، سپس با کلون کردن و ساختن یک برنچ جدید به صورت لوکال کد مورد نیاز را به ریپازیتوری اضافه کنید.
+    public Address(double latitude, double longitude, String written_address) {
+        this.latitude = latitude;
+        this.longitude = longitude;
+        this.written_address = written_address;
+    }
 
-### سعی کنید در هر مرحله تغییرات خود را کامیت کنید و در نهایت پس از اطمینان از درستی عملکرد کد خود با پوش کردن روی برنچ ساخته شده در صفحه خودتان آن را از حالت لوکال به شکل گلوبال روی گیت دربیاورید.
+    public double getdistance_from(Address address) {
+        double earthRadius = 6371; 
+        double lat1 = Math.toRadians(this.latitude);
+        double lon1 = Math.toRadians(this.longitude);
+        double lat2 = Math.toRadians(address.latitude);
+        double lon2 = Math.toRadians(address.longitude);
 
-### در نهایت با ارسال پول ریکوئست به صفحه تمرین کد شما تصحیح خواهد شد.
+        double dLat = lat2 - lat1;
+        double dLon = lon2 - lon1;
 
-### ددلاین تمرین تا روز یکشنبه 9 اردیبهشت 1403 ساعت 11.5 صبح می باشد.
-### موفق باشید :)
+        double a = Math.pow(Math.sin(dLat / 2), 2) +
+                Math.cos(lat1) * Math.cos(lat2) *
+                        Math.pow(Math.sin(dLon / 2), 2);
+
+        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+
+        return earthRadius * c;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter the latitude of the first address:");
+        double lat1 = scanner.nextDouble();
+        System.out.println("Enter the longitude of the first address:");
+        double lon1 = scanner.nextDouble();
+        scanner.nextLine(); 
+        System.out.println("Enter the written address of the first address:");
+        String writtenAddress1 = scanner.nextLine();
+
+        Address address1 = new Address(lat1, lon1, writtenAddress1);
+
+        System.out.println("Enter the latitude of the second address:");
+        double lat2 = scanner.nextDouble();
+        System.out.println("Enter the longitude of the second address:");
+        double lon2 = scanner.nextDouble();
+        scanner.nextLine(); 
+        System.out.println("Enter the written address of the second address:");
+        String writtenAddress2 = scanner.nextLine();
+
+        Address address2 = new Address(lat2, lon2, writtenAddress2);
+
+        double distance = address1.getdistance_from(address2);
+        System.out.println("The distance between the two addresses is: " + distance + " kilometers");
+scanner.close();
+    }
+}
+
+#Customer
+import java.util.Scanner;
+
+class Customer {
+    private static int customerCounter = 0;
+    private int customerNumber;
+    private String name;
+    private Address address;
+
+    public Customer(String name, Address address) {
+        this.customerNumber = ++customerCounter;
+        this.name = name;
+        this.address = address;
+    }
+
+    public int getCustomerNumber() {
+        return customerNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Address getAddress() {
+        return address;
+    }
+
+    public void setAddress(Address address) {
+        this.address = address;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter the name of the customer:");
+        String name = scanner.nextLine();
+
+        System.out.println("Enter the latitude of the customer's address:");
+        double latitude = scanner.nextDouble();
+        System.out.println("Enter the longitude of the customer's address:");
+        double longitude = scanner.nextDouble();
+        scanner.nextLine(); 
+        System.out.println("Enter the written address of the customer:");
+        String writtenAddress = scanner.nextLine();
+
+        Address customerAddress = new Address(latitude, longitude, writtenAddress);
+        Customer customer = new Customer(name, customerAddress);
+
+        System.out.println("Customer number: " + customer.getCustomerNumber());
+        System.out.println("Customer name: " + customer.getName());
+        System.out.println("Customer address: " + customer.getAddress().getdistance_from(customer.getAddress()));
+scanner.close();
+    }
+}
+
+#food
+import java.util.Vector;
+import java.util.Scanner;
+
+class Food {
+    private static Vector<Food> menu = new Vector<>();
+    private String name;
+    private int price;
+
+    public Food(String name, int price) {
+        this.name = name;
+        this.price = price;
+        menu.add(this);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter the name of the food:");
+        String foodName = scanner.nextLine();
+
+        System.out.println("Enter the price of the food:");
+        int foodPrice = scanner.nextInt();
+        scanner.nextLine();
+
+        Food food = new Food(foodName, foodPrice);
+
+        System.out.println("Food added to the menu:");
+        System.out.println("Name: " + food.getName());
+        System.out.println("Price: " + food.getPrice());
+
+        System.out.println("\nMenu:");
+        for (Food f : menu) {
+            System.out.println("Name: " + f.getName() + ", Price: " + f.getPrice());
+        }
+
+        scanner.close();
+    }
+}
+
+#Invoice
+import java.util.ArrayList;
+import java.util.Scanner;
+
+class Invoice {
+    private Customer customer;
+    private ArrayList<Item> items;
+    private int state;
+    private static final float tax_rate = 9.4f;
+
+    public Invoice(Customer customer) {
+        this.customer = customer;
+        this.items = new ArrayList<>();
+        this.state = -1;
+    }
+
+    public boolean addItem(Item item) {
+        if (state != -1) {
+            return false;
+        }
+
+        items.add(item);
+        return true;
+    }
+
+    public boolean removeItem(Item item) {
+        if (state != -1 && items.contains(item)) {
+            items.remove(item);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    public void nextStage() {
+        state++;
+    }
+
+    public int getTotalPrice() {
+        int total = 0;
+        for (Item item : items) {
+        total += item.getFood().getPrice() * item.getCount();
+        }
+        total += Math.round(total * tax_rate / 100);
+        return total;
+        }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter customer name:");
+        String customerName = scanner.nextLine();
+
+        System.out.println("Enter customer address:");
+        String customerAddress = scanner.nextLine();
+        Address address = new Address(0.0, 0.0, customerAddress);
+        Customer customer = new Customer(customerName, address);
+        Invoice invoice = new Invoice(customer);
+
+        System.out.println("Customer: " + invoice.customer.getName() + " - " + invoice.customer.getAddress());
+
+        System.out.println("Adding items to the invoice:");
+        System.out.println("Enter the name of the food:");
+        String foodName = scanner.nextLine();
+        System.out.println("Enter the price of the food:");
+        int foodPrice = scanner.nextInt();
+        scanner.nextLine(); 
+        Food food = new Food(foodName, foodPrice);
+
+        System.out.println("Enter the count of the item:");
+        int count = scanner.nextInt();
+        scanner.nextLine();
+
+        System.out.println("Enter the description of the item:");
+        String description = scanner.nextLine();
+
+        Item item = new Item(food, count, description);
+        boolean added = invoice.addItem(item);
+
+        if (added) {
+            System.out.println("Item added to the invoice successfully.");
+        } else {
+            System.out.println("Item could not be added to the invoice.");
+        }
+
+        System.out.println("Total price of the invoice (including tax): $" + invoice.getTotalPrice());
+
+        scanner.close();
+    }
+}
+
+#Item
+import java.util.Scanner;
+import java.util.Vector;
+
+
+class Item {
+    private Food food;
+    private int count;
+    private String description;
+
+    public Item(Food food, int count, String description) {
+        this.food = food;
+        this.count = count;
+        this.description = description;
+    }
+
+    public Food getFood() {
+        return food;
+    }
+
+    public int getCount() {
+        return count;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter the name of the food:");
+        String foodName = scanner.nextLine();
+
+        System.out.println("Enter the price of the food:");
+        int foodPrice = scanner.nextInt();
+        scanner.nextLine();
+
+        Food food = new Food(foodName, foodPrice);
+
+        System.out.println("Enter the count of the item:");
+        int count = scanner.nextInt();
+        scanner.nextLine();
+
+        System.out.println("Enter the description of the item:");
+        String description = scanner.nextLine();
+
+        Item item = new Item(food, count, description);
+
+        System.out.println("Item details:");
+        System.out.println("Food: " + item.getFood().getName());
+        System.out.println("Price: " + item.getFood().getPrice());
+        System.out.println("Count: " + item.getCount());
+        System.out.println("Description: " + item.getDescription());
+
+        scanner.close();
+    }
+}