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Challenge # 5

Calculate Factorial

Objective

Compute the factorial of a given non-negative integer.

You are given a non-negative integer variable n.
The factorial of n (written as n!) is the product of all positive integers less than or equal to n.
Calculate and print the factorial of n.

Constraints:

Do not use input(). • `n` will be a non-negative integer.

Exemple IO

Input: n = 5
Output: 120

Input: n = 0
Output: 1

Input: n = 3
Output: 6

Output:

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