HZNUOJ

Fibonacci Numbers

Tags:
Time Limit:  1 s      Memory Limit:   128 MB
Submission:74     AC:31     Score:98.25

Description

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

Input

100

Output

354224848179261915075

Samples

input
100
output
354224848179261915075

Hint

No generated fibonacci number in excess of 1000 digits will be in the test data, i.e. f (20) = 6765
has 4 digits.

Source

19 June, 2011 - Waterloo local contest