Exercise: Headphones |1|
~~~~~~~~~~~~~~~~~~~~~~~~

You want to buy a new pair of headphones from Amazon. The tax percentage
applied to products at Amazon is 20%.

Write a program that calculates the tax for the product. First, you
shall read an *integer* from the input; then calculate the tax value;
finally, print the result value as a *float*. (1 digit after decimal
point is sufficient)

.. container:: sampleio

   Sample I/O:

.. |1| image:: ../../figures/difficulty_one.png
   :class: difficulty

.. code:: default

   Input 1:
   200

   Output 1:
   40.0

   Input 2:
   100

   Output 2:
   20.0