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

Input: Consider Input: Problem: what is the total number of integers between 10 and 50 that are divisible by 2 ?

Output: 19


Input: Consider Input: Problem: how many zeroes are there at the end of the number n , if n = 100 ! + 200 ! ?

Output: 2


Input: Consider Input: Problem: if 18 persons can build a wall 140 m long in 42 days , the number of days that 30 persons will take to complete a similar wall 100 m long , is .


Output: 18