input: def check_sum_of_four_evens(n):
      """Determine if the input number n can be expressed as the sum of four positive even digits
      Example
      check_sum_of_four_evens(4) == False
      check_sum_of_four_evens(6) == False
      check_sum_of_four_evens(8) == True
      """
output:     if n < 8:
          return False
      for i in range(2, n, 2):
          for j in range(2, n, 2):
              for k in range(2, n, 2):
                  l = n - i - j - k
                  if l > 0 and l % 2 == 0:
                      return True
      return False