Problems
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Find the minimum of a function $f(x) = x^2 + ax + b$.
\InputFile
Two integers $a$ and $b~(|a|, |b| \le 10^6)$.
\OutputFile
Print the value of $x$ where the function $f(x)$ is minimal. Print the answer with $2$ decimal digits. It is known that $|x| \le 100$.
Input example #1
-2 -35
Output example #1
1.00