Problem Description

In Math, I am sure all of your would have known the equation of a straight line in a graph: y = mx + c. Your task is to now to create a program that finds the x-intercept of the line provided the line is in the form y = mx + c.

Input

The input will consists of 2 integers, m followed by c, where the equation of the straight line is y = mx + c.

m and c can all fit into 32-bit signed integers and m will not be 0.

Output

Output, on a single line, the x-intercept of the line, rounded to 1 decimal place.

Sample Input 1

5 2

Sample Output 1

-0.4

Sample Input 2

-5 2

Sample Output 2

0.4