user: In the midst of solving a combinatorics problem, I've hit a step that requires me to calculate the factorial of 7. Could you help me with that?

Available functions:
name: convert_currency
description: Converts a given amount from one currency to another using the ExchangeRate-API.
parameters: type: dict
properties: amount: type: float
description: The amount of money to convert, in the base currency.
from_currency: type: string
description: The ISO currency code for the base currency.
to_currency: type: string
description: The ISO currency code for the target currency.
required: amount
from_currency
to_currency
name: math_factorial
description: Calculates the factorial of a number.
parameters: type: dict
properties: n: type: integer
description: The number to calculate the factorial of.
required: n