#19Easy

Linear equation

Time: 1 s · Memory: 256 MB

Variables and types

Statement

You are given the equation $ax + b = 0$ with $a \ne 0$ . Find the unknown $x$ .

Input format

A single line with two integers $a$ and $b$ ( $1 \le |a|, |b| \le 1000$ ).

Output format

A single number — $x$ with exactly 2 digits after the decimal point.

Examples

Input

2 -4

Output

2.00

Input

3 1

Output

-0.33

Note

From the equation, $x = -\dfrac{b}{a}$ . Remember that C++ and Go drop the fractional part when dividing two integers: 3 / 2 is 1. Convert one of them to floating point: -b / (double)a.

Linear equation

Time: 1 s · Memory: 256 MB

Variables and types

Statement

You are given the equation $ax + b = 0$ with $a \ne 0$ . Find the unknown $x$ .

Input format

A single line with two integers $a$ and $b$ ( $1 \le |a|, |b| \le 1000$ ).

Output format

A single number — $x$ with exactly 2 digits after the decimal point.

Examples

Input

2 -4

Output

2.00

Input

3 1

Output

-0.33

Note

From the equation, $x = -\dfrac{b}{a}$ . Remember that C++ and Go drop the fractional part when dividing two integers: 3 / 2 is 1. Convert one of them to floating point: -b / (double)a.