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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.
Input Format 
A number n
Output Format 
A number representing the number of ways to climb the stairs from 0 to top.
Question Video
Constraints 
0 <= n <= 20
Sample Input 
4
Sample Output 
7


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