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Tiling With 2 * 1 Tiles

1. You are given a number n representing the length of a floor space which is 2m wide. It's a 2 * n board. 2. You've an infinite supply of 2 * 1 tiles. 3. You are required to calculate and print the number of ways floor can be tiled using tiles.

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Tiling With 2 * 1 Tiles

easy

1. You are given a number n representing the length of a floor space which is 2m wide. It's a 2 * n board. 2. You've an infinite supply of 2 * 1 tiles. 3. You are required to calculate and print the number of ways floor can be tiled using tiles.

Constraints

1 <= n <= 100

Format

Input

A number n

Output

A number representing the number of ways in which the number of ways floor can be tiled using tiles.

Example

Sample Input

8

Sample Output

34

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