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

Ex Input:
Problem: the population of a bacteria culture doubles every 2 minutes . approximately how many minutes will it take for the population to grow from 1,000 to 300,000 bacteria

Ex Output:
16


Ex Input:
Problem: the total age of a and b is 12 years more than the total age of b and c . c is how many year younger than a

Ex Output:
12


Ex Input:
Problem: a can do a work in 6 days . b can do the same work in 12 days . if both a & b are working together in how many days they will finish the work ?

Ex Output:

4