Description

There are many parallel lines on the ground with the distance of D between each adjacent two. Now, throwing a needle randomly on the ground，please calculate the possibility of that the needle can be across one of the lines.

Input

The input consists of multiple test cases. Each test case contains 2 integers D, L on a single line (1 <= D, L <= 100). The input is ended with EOF.

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Output

For each test case, print an integer of (int)(P*10000) where P is the possibility asked above. For example, when P = 0.25658，you should output 2565.

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Sample Input

4 2
2 4

Sample Output

3183
8372

HINT

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Source

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