0085. Sikl25

Time limit : 1000 ms
Memory limit : 64 mb

Summani xisoblang


$$y = \frac{ax^2 + bx + c}{a^2 + b^2 + x^2}$$

$$1 \le x \le 20, h = 5$$

Bu yerda $x$ 1 va 20 oralig’ida, $h$ sikl qadami


Kiruvchi ma’lumotlar:

$a, b, c$ butun son $(0 \le a,b,c \le 100)$;


Chiquvchi ma’lumotlar:

$y$ – masala yechimi $10^{-2}$ aniqlikda chiqarilsin.

Input
2 1 2
Output
6.84
Input
3 1 3
Output
9.02