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: At a pie-eating contest, Erik got through 0.63 piebefore time was called ; Frank finished just 0.33 pie. How much more pie did Erik eat than Frank?
Example Output: 0.3

Example Input: Fred has 10 red balloons, Sam has 46 red balloons, and Dan has 16red balloons. The balloons cost 10 dollars. How many red balloonsdo they have in all?
Example Output: 72.0

Example Input: A petri dish originally contained 600 bacteria. A scientist let thebacteria grow and now there are 8917 of them. How many morebacteria are there now?
Example Output:
8317.0