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

Example Input: Problem: what is the sum of the multiples of 4 between 63 and 151 inclusive ?
Example Output: 233

Example Input: Problem: a jar of 364 marbles is divided equally among a group of marble - players today . if 2 people joined the group in the future , each person would receive 1 marble less . how many people are there in the group today ?
Example Output: 26

Example Input: Problem: the sum of even numbers between 1 and 31 is
Example Output:
240