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

Input: Consider Input: Problem: if the sides of a triangle are 26 cm , 24 cm and 15 cm , what is its area ?

Output: 180


Input: Consider Input: Problem: each of the products produced yesterday was checked by worker x or worker y . 0.5 % of the products checked by worker x are defective and 0.8 % of the products checked by worker y are defective . if the total defective rate of all the products checked by worker x and worker y is 0.74 % , what fraction of the products was checked by worker y ?

Output: 4 / 


Input: Consider Input: Problem: a box contains 21 electric bulbs , out of which 4 are defective . two bulbs are chosen at random from this box . the probability that at least one of these is defective is


Output: 31 / 8