input: def is_sum_of_four_evens(n):
      """Determine if the number n can be expressed as the sum of precisely four positive even integers
      Example
      is_sum_of_four_evens(4) == False
      is_sum_of_four_evens(6) == False
      is_sum_of_four_evens(8) == True
      """
output:     if n < 8:
          return False
      return n % 2 == 0