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

Ex Input:
Problem: an aeroplane covers a certain distance of 670 kmph in 6 hours . to cover the same distance in 6 1 / 4 hours , it must travel at a speed of

Ex Output:
643


Ex Input:
Problem: a group of students decided to collect as many paise from each member of group as is the number of members . if the total collection amounts to rs . 46.24 , the number of the member is the group is :

Ex Output:
68


Ex Input:
Problem: if the product of 10 integers is negative , at most how many of the integers can be negative ?

Ex Output:

9