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

Input: Consider Input: Problem: a car salesman earns a base salary of $ 1000 per month plus a commission of $ 200 for each car he sells . if the car salesman earned $ 2000 in march , how many cars does he need to sell in april in order to double his march earnings ?

Output: 15


Input: Consider Input: Problem: a person was asked to subtract 25 % of a number from the original but he subtracted 25 from the number . his answer was 25 more than correct one . what was the original number ?

Output: 200


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


Output: 13