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.

Ex Input:
A construction company bought 5.91 tons of gravel and 8.19 tons ofsand. How many tons of material did the company buy in all?

Ex Output:
14.1


Ex Input:
Kenji and his classmates placed colored blocks on a scale during ascience lab. The yellow block weighed 0.6 pounds and the greenblock weighed 0.4 pounds. How much more did the yellow blockweigh than the green block?

Ex Output:
0.2


Ex Input:
Joan has 47 green and 48 red marbles. Fred took 24 of Joan's greenmarbles. How many green marbles does Joan now have?

Ex Output:

23.0