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Problems

Value of variable 5

Value of variable 5

Time limit 1 second
Memory limit 128 MiB

Find the value of the variable y for a given real value of the variable x.

Image 5.jpg

Input data

Value of the variable x.

Output data

Print the value of the variable y up to thousandths.

Examples

Input example #1
1
Output example #1
0.000
Author Matviychuk Sergiy
Source "ABC programming"