Math functions

Write a program that reads an integer and calculates the value of its logistic function. A logistic function, or sigmoid function, is a function defined by the formula $\sigma(x) = \frac{1}{1 + e^{-x}} = \frac{e^x}{e^{x} + 1}$.

Print the result rounded to 2 decimal places.

You can use math.e constant equal to 2.718281… or sort of a shortcut math.exp(x) function, which is considered more accurate than math.e ** x or pow(math.e, x).