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

Ex Input:
Problem: find the cost of fencing around a circular field of diameter 16 m at the rate of rs . 3 a meter ?

Ex Output:
150.84


Ex Input:
Problem: in a class of 32 students , 2 students did not borrow any books from the library , 12 students each borrowed 1 book , 10 students each borrowed 2 books , and the rest borrowed at least 3 books . if the average number of books per student was 2 , what is the maximum number of books any single student could have borrowed ?

Ex Output:
11


Ex Input:
Problem: if a truck is traveling at a constant rate of 108 kilometers per hour , how many seconds will it take the truck to travel a distance of 600 meters ? ( 1 kilometer = 1000 meters )

Ex Output:

20