Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

Ex 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 ?

Ex Output:
45

Ex Input:
chloe was making baggies of cookies with 7 cookies in each bag . if she had 34 chocolate chip cookies and 29 oatmeal cookies how many baggies could she make ?

Ex Output:
9

Ex Input:
last week fred had 46 dollars and jason had 13 dollars . fred washed cars over the weekend and now has 57 dollars . how much money did fred make washing cars ?

Ex Output:
11