# Function

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Let function f(x) is defined as

Calculate the value of f(x) for a given x.

## Input

Each line contains one double value x (x ≥ 1).

## Output

For each value x print on a separate line the value f(x) with 6 digits after the decimal point.

## Examples

Input #1

Answer #1

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