Problems
Value of variable 1
Value of variable 1
Find the value of the variable $y$ for a given real value of the variable $x$.
$$
y = x^3 - {5 x^2 \over 7} + 9x - {3 \over x} + 1
$$
\InputFile
Value of the variable $x$.
\OutputFile
Print the value of the variable $y$ up to thousandths.
Input example #1
1
Output example #1
7.286