You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.

Example Input: There are 107 walnut trees currently in the park. Park workers willplant 104 walnut trees today. How many walnut trees will the parkhave when the workers are finished?
Example Output: 211.0

Example Input: This afternoon Craig left school, rode the bus 3.8 miles, and then walked 0.2 mile to get home. How much farther did Craig ride than walk?
Example Output: 3.6

Example Input: Elizabeth went to the salon and had 0.3 inch of hair cut off. Then next day she went back and asked for another 0.5 inch to be cut off. How much hair did she have cut off in all?
Example Output:
0.8