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

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 circular ground whose diameter is 70 metres , has a 2.8 metre - broad garden around it . what is the area of the garden in square metres ?

Output: 640.64


Input: Consider Input: Problem: what will be the vulgar fraction of 0.5


Output: 1 / 2