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

Ex Input:
Problem: if x and j are integers and 2 x – j = 11 , then 4 x + j can not be

Ex Output:
17


Ex Input:
Problem: for any integer n greater than 1 , n * denotes the product of all the integers from 1 to n , inclusive . how many prime numbers are there between 6 * + 2 and 6 * + 6 , inclusive ?

Ex Output:
none


Ex Input:
Problem: a sum of money is put out at compound interest for 2 years at 20 % . it would fetch rs . 723 more if the interest were payable half - yearly , then it were pay able yearly . find the sum .

Ex Output:

30000