Newb: Simple Explicit Formula

[buran]

raw_input (in Python2) and input (the equivalent in Python3) return str. you need to convert that to int or float to use in calculations

Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x = raw_input('some number: ')
some number: 3
>>> x
'3'
>>> type(x)
<type 'str'>
>>> int(x)
3
>>> float(x)
3.0