Adjust Screen Brightness Based on Ambient Light Level

You are given a single floating-point number representing the ambient light level. Based on this value, you are to compute the corresponding screen brightness percentage according to the following rules:

• If the light level is negative, you should output the error message: Light level cannot be negative.
• If \(L < 20.0\), the brightness is \(10\)%.
• If \(20.0 \le L < 50.0\), the brightness is \(30\)%.
• If \(50.0 \le L < 80.0\), the brightness is \(60\)%.
• If \(80.0 \le L < 100.0\), the brightness is \(90\)%.
• If \(L \ge 100.0\), the brightness is \(100\)%.

Your program should read the input from standard input and write the result to standard output.

inputFormat

The input consists of a single line containing a floating-point number representing the ambient light level.

outputFormat

Print a single integer representing the screen brightness percentage according to the rules above. If the ambient light level is negative, print the error message: Light level cannot be negative.

-5.0

Light level cannot be negative