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100 - Let's Celebrate the 100th Contest on ZOJ! - 100I
1KB

Time Limit: 5 Seconds      Memory Limit: 65536 KB      Special Judge

Give you an integer number n. Please find out the answer of the expression below.

1KB_img2.png

Please note that the submission limit of this problem is 1KB.

Input

There are multiple test cases (No more than 100). Each test case contains a single integer n (1 <= n <= 100).

Output

For each test case, print the answer in a line. The number should be rounded into 100 decimal digits.

Sample Input

1
2

Sample Output

2.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
2.7071067811865475244008443621048490392848359376884740365883398689953662392310535194251937671638207864

Author: JIANG, Kai
Source: Let's Celebrate the 100th Contest on ZOJ!
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