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 69 erasers in a box . Jane has 15 erasers in a bag . Doris takes 54 erasers out of the box . How many erasers are left in the box ?

Output: 15


Input: Consider Input: Mark has 13 trees in his backyard . If he plants 12 more , how many trees will he have ?

Output: 25


Input: Consider Input: A cake recipe requires 0.6 cup of sugar for the frosting and 0.2 cup of sugar for the cake . How much sugar is that altogether ?


Output: 0.8