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Given N, count the number of ways to express N as sum of 1, 3 and 4.

Input :  N = 4
Output : 4 
Explanation: 1+1+1+1 
             1+3
             3+1 
             4 

Input : N = 5 
Output : 6
Explanation: 1 + 1 + 1 + 1 + 1
             1 + 4
             4 + 1
             1 + 1 + 3
             1 + 3 + 1
             3 + 1 + 1