The task is to generate the correct answer for a given math problem.

Example Input: Problem: 12 . what is the dividend . divisor 17 , the quotient is 9 and the remainder is 10 .
Example Output: 163

Example Input: Problem: a is twice as good a workman as b and they took 6 days together to do the work b alone can do it in .
Example Output: 18 days

Example Input: Problem: what is the units digit of ( 3 ^ 16 ) ( 4 ^ 13 ) ?
Example Output:
4