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NADOS

4 Key Keyboard

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1. Imagine you have a special keyboard with the following keys - 
   Key 1 : Print 'X' on the screen.
   key 2 : Select screen.
   Key 3 : Copy selection to buffer.
   Key 4 : Print buffer on screen appending to what has already been printed.
2. You are given a number N, which represents the number of times the keyboard is pressed.
3. You have to find the maximum number of 'X' that can be produced by pressing the N number of keys.
Input Format 
A number N
Output Format 
Check the sample output and question video.
Question Video

Constraints 
1 <= N <= 100
Sample Input 
3
Sample Output 
3


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