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:
Ron weighed 2 colored metal balls during a science class. The blue ball weighed 6 pounds and the brown ball weighed 3.1 pounds. If Ron places both balls on the scale at the same time, what will thescale read?

Ex Output:
9.1


Ex Input:
Molly owns the Wafting Pie Company. This morning, her employeesused 816 eggs to bake pumpkin pies. If her employees used a total of1339 eggs today, how many eggs did they use in the afternoon?

Ex Output:
523.0


Ex Input:
Irene just bought a new lamp for her bedside table. The old lamp was 1 foot tall and the new lamp is 2.3 feet tall. How much taller is the new lamp than the old lamp?

Ex Output:

1.3