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

Ex Input:
Problem: | x + 3 | – | 4 - x | = | 9 + x | how many solutions will this equation have ?

Ex Output:
1


Ex Input:
Problem: a man whose speed is 4.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph , find his average speed for the total journey ?

Ex Output:
4


Ex Input:
Problem: thirty percent of the members of a swim club have passed the lifesaving test . among the members who have not passed the test , 12 have taken the preparatory course and 30 have not taken the course . how many members are there in the swim club ?

Ex Output:

60