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

Input: Consider Input: amy has 67 balloons . 29 of them are red and 17 are green . the rest of the balloons are blue . how many blue balloons does amy have ?

Output: 21

Input: Consider Input: nancy had 43 files on her computer . she deleted 31 of them and put the rest into folders with 6 files in each one . how many folders did nancy end up with ?

Output: 2

Input: Consider Input: kevin collected toys to use as prizes at the fair . he collected 14 stuffed animals . he also collected 18 frisbees and several yo-yos . kevin has 50 prizes in all . how many yo-yos did kevin collect ?
Output: 18