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Problems

Price function - 1

Price function - 1

Time limit 1 second
Memory limit 128 MiB
funksiya-test-2.png

Find the value of price function:

Input data

Two real numbers x and k.

Output data

Print the value of price function y with 2 decimal digits.

Examples

Input example #1
5 8.2
Output example #1
21.04
Author Mayis Eyniyev