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

Ex Input:
Problem: the average of first 10 odd numbers is ?

Ex Output:
10


Ex Input:
Problem: a diagonal of a polygon is an segment between two non - adjacent vertices of the polygon . how many diagonals does a regular 20 - sided polygon have ?

Ex Output:
170', 'c ) 1425', 'd ) 2025', 'e ) 2500'


Ex Input:
Problem: what is the prime factors ’ number of 18 ?

Ex Output:

3