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## 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 = *m*x + *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

### Tags

### Subtasks and Limits

Subtask | Score | #TC | Time | Memory | Scoring |
---|---|---|---|---|---|

1 | 100 | 10 | 1s | 32MB | Average |

2 | 0 | 2 | 1s | 32MB | Average |

### Judge Compile Command

g++-7 ans.cpp -o strlineeqn -Wall -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512