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

Ex Input:
Problem: a number is said to be prime saturated if the product of all the different positive prime factors of z is less than the square root of z . what is the greatest two digit prime saturated integer ?

Ex Output:
96


Ex Input:
Problem: what is the units digit of 26 ! + 50 ! + 4 ! + 4 ! ?

Ex Output:
8


Ex Input:
Problem: the ratio of the radius of two circles is 2 : 5 , and then the ratio of their areas is ?

Ex Output:

4 : 25