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

Ex Input:
Luke was helping the cafeteria workers pick up lunch trays , but he could only carry 4 trays at a time . If he had to pick up 20 trays from one table and 16 trays from another , how many trips will he make ?

Ex Output:
9


Ex Input:
Rosa had 67 flowers . Andre gave her some more flowers . Now , Rosa has 90 flowers . How many flowers did Andre give to Rosa ?

Ex Output:
23


Ex Input:
Mary found 45 seashells , Melanie found 23 seashells , and Jason found 32 seashells on the beach . When they cleaned them , they discovered that 31 were cracked . How many seashells did they find together ?

Ex Output:

100