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).
Input Format
A number n
Output Format
A number representing the number of valleys and mountains you can create using strokes.
Question Video
Constraints
0 <= n <= 15
Sample Input
4
Sample Output
14


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