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

Ex Input:
Problem: income and expenditure of a person are in the ratio 7 : 6 . if the income of the person is rs . 14000 , then find his savings ?

Ex Output:
2000


Ex Input:
Problem: 20 is subtracted from 80 % of a number , the result is 60 . find the number ?

Ex Output:
100


Ex Input:
Problem: 25 * 25 * 25 * 25 * 25 = 5 ^ ?

Ex Output:

1