Competitions

# Value of expression 1

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

#### 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"