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:
Elisa has 37 dollars . How many more dollars does she have to earn to have 53 dollars ?

Ex Output:
16

Ex Input:
For homework Nancy had 17 math problems and 15 spelling problems . If she can finish 8 problems in an hour how long will it take her to finish all the problems ?

Ex Output:
4

Ex Input:
Willy has 1400 crayons . Lucy has 290 crayons . How many more crayons does Willy have then Lucy ?

Ex Output:
1110