This cryptarithm is built in such a way that
first you multiply two numbers and then add to the result one extra
number to get the final result. Every asterisk in this cryptarithm
means some digit from 1 through 9, and every digit is used exactly
once. 0 isn't used.
The object is to replace all the asterisks with digits from 1 through
9 so that the whole calculation is correct. The solution is unique.