Consider a positive integer as "charming" if its prime factors are less than

$10$

$,$

$$i

$.$

e

$.$

$2$

$,$

$3$

$,$

$5$

$,$

$$and

$7$

$.$

Write a python function is

$\_$

charming

$($

num

$)$

$$that given a positive integer num returns True if num is a charming number and False otherwise. You can assume that num is larger than

$1$