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

Ex Input:
Problem: a work as fast as b . if b can complete a work in 8 days independently , the number of days in which a and b can together finish the work in ?

Ex Output:
2 2 / 3 days


Ex Input:
Problem: h is a positive integer and 225 and 216 are both divisors of h . if h = ( 2 ^ a ) * ( 3 ^ b ) * ( 5 ^ c ) , where a , b and c are positive integers , what is the least possible value of a + b + c ?

Ex Output:
8


Ex Input:
Problem: what is 3 2 / 3 - 2 1 / 4 divided by 6 / 7 - 2 / 5 ?

Ex Output:

17 / 64