Current issue: Taking input to select a dictionary key, and add in a `quantity` key:value pair to that nested dictionary.

This is my attempt

```py
menu = {
    1: {"item": "Green Beret Omelette", "price": "$12.99"},
    2: {"item": "Get to the Chopped Salad", "price": "$14.99"},
    3: {"item": "Pump You Up Protein Shake", "price": "$9.99"},
    4: {"item": "I'll Be Baby Back Ribs", "price": "$22.99"},
    5: {"item": "Let Off Some Steamed Vegetables", "price": "$4.99"},
    6: {"item": "The Ice Cream Cometh", "price": "$15.99"}
}

selection = int(input("Please select your item:\n"))
if int(selection) < 1 or int(selection) > 6:
    print("Invalid selection. Please try again. \n")

count = int(input("Enter quantity: \n"))

# This is the line I'd like help with
menu[selection].update["quantity": count]

```

How do I structure the line `menu[selection].update["quantity": count]` so that menu would be updated to:

```py
menu = {
    1: {"item": "Green Beret Omelette", "price": "$12.99", "quantity": 2},  # Note the new k:v here
    2: {"item": "Get to the Chopped Salad", "price": "$14.99"},
    3: {"item": "Pump You Up Protein Shake", "price": "$9.99"},
    4: {"item": "I'll Be Baby Back Ribs", "price": "$22.99"},
    5: {"item": "Let Off Some Steamed Vegetables", "price": "$4.99"},
    6: {"item": "The Ice Cream Cometh", "price": "$15.99"}
}

```