## Task 2 - 060912

If we form the cross sum of a natural number and then (if possible) the cross sum of this number again, etc., we finally obtain a single-digit number, which we will call the "final cross sum." By definition, the cross sum of a single-digit number is set to be the number itself.

Calculate how many natural numbers from 1 to 1000 have the "final cross sum" 9!