#900. Function f(x) = 4x² - 4x + 1
Write a function `def f(x):` that returns f(x) = 4x² - 4x + 1. Print f(x) for the x given in the input.
### Input
One integer x (-100 ≤ x ≤ 100).
### Output
A number.
Examples
Input
2
Output
9
Input
-15
Output
961
💡 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.