#891. Function f(x) = x² - x - 1
Write a function `def f(x):` that returns f(x) = x² - x - 1. Print f(x) for the x given in the input.
### Input
One integer x (-100 ≤ x ≤ 100).
### Output
A number.
Examples
Input
-4
Output
19
Input
-6
Output
41
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.