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Count Of Valleys And Mountains

1. You are given a number n, representing the number of upstrokes / and number of downstrokes . 2. You are required to find the number of valleys and mountains you can create using strokes. E.g. <img src="http://pepcoding.com/resources/ojquestionresource/images/countvalleys2.JPG" alt="countvalleys"> Note -> At no point should we go below the sea-level. (number of downstrokes should never be more than number of upstrokes).

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Count Of Valleys And Mountains

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1. You are given a number n, representing the number of upstrokes / and number of downstrokes . 2. You are required to find the number of valleys and mountains you can create using strokes. E.g. countvalleys Note -> At no point should we go below the sea-level. (number of downstrokes should never be more than number of upstrokes).

Constraints

0 <= n <= 15

Format

Input

A number n

Output

A number representing the number of valleys and mountains you can create using strokes.

Example

Sample Input

4

Sample Output

14

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