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Problem 1330 Center of Gravity

Accept: 455    Submit: 848
Time Limit: 1000 mSec    Memory Limit : 32768 KB

Problem Description

Given a sector of radius R, central angle P. You are to calculate the distance between the center of gravity and the center of the circle.

Input

Given a sector of radius R, central angle P. You are to calculate the distance between the center of gravity and the center of the circle.

Output

Given a sector of radius R, central angle P. You are to calculate the distance between the center of gravity and the center of the circle.

Sample Input

0.01 6.28

Sample Output

0.000003

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