点击此处就可以传送hdu 1250

Problem Description

A Fibonacci sequence is calculated by adding the previous two members the sequence, with the first two members being both 1.
F(1) = 1, F(2) = 1, F(3) = 1,F(4) = 1, F(n>4) = F(n - 1) + F(n-2) + F(n-3) + F(n-4)
Your task is to take a number as input, and print that Fibonacci number.





Input

Each line will contain an integers. Process to end of file.





Output

For each case, output the result in a line.




Sample Input

100





Sample Output

4203968145672990846840663646


Note:
No generated Fibonacci