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Problems

Value of expression 1

Value of expression 1

Find the value of expression for the given values of the variables x and y.

Image 7.jpg

Input

Values of the variables x and y.

Output

Print the value of expression up to thousandths.

Time limit 1 second
Memory limit 128 MiB
Input example #1
1.000 -2.000
Output example #1
21.857
Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"