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

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

Ex Output:
23


Ex Input:
Problem: 5 / 8 of 3 / 10 of a number is greater than 4 / 9 of 1 / 4 of the same number by 55 . what is half of that number ?

Ex Output:
36


Ex Input:
Problem: after spending rs . 5000 on rent , rs . 1500 on milk , rs . 4500 on groceries , rs . 2500 on childrens education rs . 2000 on petrol and rs . 2500 on miscellaneous expenses , mr . kishore saved 10 % of his monthly salary . how much did he save in rs . ?

Ex Output:

2000