# Squares - 2

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

In the white square $n$ times the same operation was performed: one of the smallest white squares was divided into $4$ identical squares and $2$ of them were painted black. For a given $n$ calculate how many percents of the area takes the black figure.

## Input

One integer $n(1≤n≤100)$.

## Output

Print the area of the black figure in percents, rounded to $5$ decimal digits.

## Examples

Input #1

Answer #1

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Acceptance rate 44%