items = {
    "laptop": lambda x: x * 600,
    "raspberry pi": lambda x: x * 5,
    "arduino": lambda x: x * 50,
}

quantity = 4
value_of_laptop = items["laptop"](quantity)
print(f"value of {quantity} laptops = ${value_of_laptop}")

quantity = 2
value_of_raspi = items["raspberry pi"](quantity)
print(f"value of {quantity} raspberry pi = ${value_of_raspi }")