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

Ex Input:
Problem: in how many no . between 10 and 30 exactly two of the digits is 2 ?

Ex Output:
1


Ex Input:
Problem: the total age of a and b is 14 years more than the total age of b and c . c is how many years younger than a ?

Ex Output:
14


Ex Input:
Problem: a person spends 1 / 3 rd of the money with him on clothes , 1 / 5 th of the remaining on food and 1 / 4 th of the remaining on travel . now , he is left with rs 200 . how much did he have with him in the beginning ?

Ex Output:

s 500