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

Ex Input:
Problem: how many multiples of 7 are there between 10 and 100 ( both are inclusive ) ?

Ex Output:
13

Ex Input:
Problem: if x = 1 + 2 , then what is the value of x 4 - 4 x 3 + 4 x 2 + 3 ?

Ex Output:
4

Ex Input:
Problem: carl is facing very difficult financial times and can only pay the interest on a $ 10,000 loan he has taken . the bank charges him a quarterly compound rate of 8 % . what is the approximate interest he pays annually ?

Ex Output:
3500