Count Of Valleys And Mountains
easy
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.
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
Question Video