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

Input: Consider Input: Problem: 2,7 , 17,3 , 11,19 , 5,13 , __

Output: 23

Input: Consider Input: Problem: ajay can ride 50 km in 1 hour . in how many hours he can ride 1000 km ?

Output: 20 hrs

Input: Consider Input: Problem: how many numbers between 400 and 1000 can be made with the digits 2 , 3,4 , 5,6 and 0 ?
Output: 60