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: professor treehead of the flora university requested his students to participate . he said that they planted 15 species of trees in the natural park 20 species of trees in the neighboring forest and 10 species of trees all around different locations in town . how many species of trees were planted by the students ?

Output: 45

Input: Consider Input: cindy has 105 stickers . she uses 23 stickers . she buys 45 more stickers . how many stickers does cindy have now ?

Output: 127

Input: Consider Input: an online toy store stocked some toys . it sold 38 toys at the first week and 26 toys at the second week . if it had 19 toys left how many toys were in stock at the beginning ?
Output: 83