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Catalan Number

1. You are given a number n. 2. You are required to find the value of nth catalan number. C0 -> 1 C1 -> 1 C2 -> 2 C3 -> 5 .. Cn -> C0.Cn-1 + C1.Cn-2 + .. + Cn-2.C1 + Cn-1.C0

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Catalan Number

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1. You are given a number n. 2. You are required to find the value of nth catalan number. C0 -> 1 C1 -> 1 C2 -> 2 C3 -> 5 .. Cn -> C0.Cn-1 + C1.Cn-2 + .. + Cn-2.C1 + Cn-1.C0

Constraints

0 <= n <= 15

Format

Input

A number n

Output

A number representing the value of nth catalan number.

Example

Sample Input

4

Sample Output

14

Question Video

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