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Climb Stairs

1. You are given a number n, representing the number of stairs in a staircase. 2. You are on the 0th step and are required to climb to the top. 3. In one move, you are allowed to climb 1, 2 or 3 stairs. 4. You are required to print the number of different paths via which you can climb to the top.

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Climb Stairs

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1. You are given a number n, representing the number of stairs in a staircase. 2. You are on the 0th step and are required to climb to the top. 3. In one move, you are allowed to climb 1, 2 or 3 stairs. 4. You are required to print the number of different paths via which you can climb to the top.

Constraints

0 <= n <= 20

Format

Input

A number n

Output

A number representing the number of ways to climb the stairs from 0 to top.

Example

Sample Input

4

Sample Output

7

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