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Number Of Bsts

1. You are given a number n, representing the number of elements. 2. You are required to find the number of Binary Search Trees you can create using the elements.

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Number Of Bsts

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1. You are given a number n, representing the number of elements. 2. You are required to find the number of Binary Search Trees you can create using the elements.

Constraints

0 <= n <= 15

Format

Input

A number n

Output

A number representing the number of Binary Search Trees you can create using the elements.

Example

Sample Input

4

Sample Output

14

Question Video

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