#221. Number of roots of a quadratic equation
You get a, b, c (a ≠ 0) of the equation a·x² + b·x + c = 0. Print how many real roots it has (0, 1 or 2).
### Input
a, b, c, each on its own line.
### Output
0, 1 or 2.
Examples
Input
1 2 1
Output
1
Input
1 -3 2
Output
2
💡 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.