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:
Billy has 62 crayons . 52 are eaten by a hippopotamus . How many crayons will Billy have ?

Ex Output:
10


Ex Input:
Gwen had 18 math problems and 11 science problems for homework . If she finished 24 of the problems at school , how many problems did she have to do for homework ?

Ex Output:
5


Ex Input:
Mike had 34 peaches at his roadside fruit dish . He went to the orchard and picked peaches to stock up . There are now 86 peaches . how many did he pick ?

Ex Output:

52