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

Ex Input:
Theresa has 32 crayons . Janice has 12 crayons . She shares 13 with Nancy . How many crayons will Theresa have ?

Ex Output:
19


Ex Input:
The school is planning a field trip . There are 14 students and 2 seats on each school bus . How many buses are needed to take the trip ?

Ex Output:
7


Ex Input:
A restaurant made 9 hamburgers to serve during lunch . Only 3 were actually served . How many hamburgers were over from lunch ?

Ex Output:

6