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

Ex Input:
Problem: a retailer buys 80 pens at the market price of 36 pens from a wholesaler , if he sells these pens giving a discount of 1 % , what is the profit % ?

Ex Output:
12


Ex Input:
Problem: what is the units digit of 17 ^ 83 × 13 ^ 82 × 11 ^ 67 ?

Ex Output:
4


Ex Input:
Problem: a number whose fifth part increased by 5 is equal to its fourth part diminished by 5 is ?

Ex Output:

200