You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Ex Input:
At the town carnival Oliver rode the ferris wheel 7 times and the bumper cars 3 times . If each ride cost 3 tickets , how many tickets did he use ?

Ex Output:
30

Ex Input:
There are 64 students trying out for the school 's trivia teams . If 36 of them did n't get picked for the team and the rest were put into 4 groups , how many students would be in each group ?

Ex Output:
7

Ex Input:
A worksheet had 4 problems on it . If a teacher had 9 worksheets to grade and had already graded 5 of them , how many more problems does she have to grade ?

Ex Output:
16