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

Example Input: Problem: albert invested rs . 8000 in a scheme for 2 years at compound interest rate 5 % p . a . how much amount will albert get on maturity of the fixed deposit ?
Example Output: 882

Example Input: Problem: a can do a piece of work in 80 days . he works at it for 10 days b alone finishes the remaining work in 42 days . in how much time will a and b working together , finish the work ?
Example Output: 30

Example Input: Problem: the smallest value of n , for which n + 3 is not a prime number , is
Example Output: