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

Ex Input:
Problem: a teacher grades students ’ tests by subtracting twice the number of incorrect responses from the number of correct responses . if student a answers each of the 100 questions on her test and receives a score of 76 , how many questions did student a answer correctly ?

Ex Output:
92


Ex 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 ?

Ex Output:
15


Ex Input:
Problem: evaluate 28 % of 450 + 45 % of 260

Ex Output:

243