input: from typing import List
  
  def factorial_of(n: int) -> int:
      """
      Compute and print the factorial of a given integer.
  
      >>> factorial_of(7)
      5040
      >>> factorial_of(4)
      24
      """
      if n <= 1:
          return 1
      return n * factorial_of(n - 1)
output:     if n <= 1:
          return 1
      return n * factorial_of(n - 1)