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.

Input: Consider Input: There are 12 birds on the fence . 8 more birds land on the fence . How many birds are on the fence ?

Output: 20


Input: Consider Input: Joan has 47 green and 48 red marbles . Fred took 24 of Joan 's green marbles . How many green marbles does Joan now have ?

Output: 23


Input: Consider Input: Jesse starts with 78 pencils . He gives 44 to Joshua . How many pencils does Jesse end with ?


Output: 34