products ={"laptop": 75000,
           "smartphone": 30000,
           "headphones": 5000,
           "keyboard": 3500,
           "mouse": 2000
}

cart = []

def view_products():
    for product, price in products.items():
        print(f"{product}: ${price}")

def add_to_cart(product_name):
    if product_name in products:
        cart.append(product_name)
        print(f"{product_name}(s) added to your cart.")
    else:
        print("Product not found.") 

def view_cart():
    print("Your cart contains:")
    for product in cart:
        print(f"- {product}: ${products[product]}")

def total_cart_value():
    total = sum(products[product] for product in cart)
    print(f"Total value of your cart: ${total}") 

def exit_cart():
    print("Exiting the shopping cart. Thank you for shopping with us!")

while True:
    print("\nWelcome to the Shopping Cart!")
    print("1. View products")
    print("2. Add product to cart")
    print("3. View cart")
    print("4. Exit")
    user_choice = input("Enter your choice (1-4): ")

    if user_choice == "1":
        view_products()

    elif user_choice == "2":
        product_name = input("Enter the product name to add to cart: ")
        add_to_cart(product_name)

    elif user_choice == "3":
        view_cart()

    elif user_choice == "4":
        exit_cart()
        break

    else:
        print("Invalid choice. Please enter a number from 1 to 4. ")