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

Ex Input:
Problem: how many numbers between 200 and 600 are divisible by 4 , 5 and 6 ?

Ex Output:
6

Ex Input:
Problem: the ratio between b and y is 7 / 9 ; b and y are increased by 4 , what is the ratio between the new values of b and y ?

Ex Output:
it can not be determine

Ex Input:
Problem: if ( x - 10 ) ( y - 5 ) ( z - 2 ) = 1000 then what is the least value of x + y + z ? if x , y , z are all integer no .

Ex Output:
7