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:
There are 7 crayons in the drawer and 6 crayons on the desk. Samplaced 4 crayons and 8 scissors on the desk. How many crayons arenow there in total?

Ex Output:
17.0

Ex Input:
Greg and Sharon own neighboring cornfields. Greg harvested 0.4 acreof corn on Monday and Sharon harvested 0.1 acre. How many moreacres did Greg harvest than Sharon?

Ex Output:
0.3

Ex Input:
Alyssa bought some toys. She bought a football for $5.71, and spent $6.59 on marbles. In total, how much did Alyssa spend on toys?

Ex Output:
12.3