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

Input: Consider 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

Output: 12


Input: Consider Input: Problem: how many multiples of 7 are there between 10 and 100 ( both are inclusive ) ?

Output: 13


Input: Consider Input: Problem: a dishonest dealer professes to sell goods at the cost price but uses a weight of 800 grams per kg , what is his percent ?


Output: 25 %