IWGBS - 0110SS

Dor is IWGolymp student so he has to count in how many ways he can make N digit numbers that is formed by ones and zeroes. But zeroes can not be next to each other. Help to him in how many different numbers can he make.

For example, N = 3: 101, 010, 111, 110, 011

Note: A leading zero is allowed.

Input

A positive integer N (1 <= N <= 10000).

Output

Answer for the problem.

Example

Input:
2

Output:
3

Added by:Azat Taryhchiyev
Date:2012-02-16
Time limit:0.100s-3.085s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64

hide comments
2020-07-23 18:23:02
Use basic memoization dp (replace INT by BIGINT ) ( bigint implementation:: <snip> ) . EASY AC :)

Last edit: 2023-01-23 08:17:03
2019-11-26 14:12:22
JAVA BigInteger + Pattern = AC ;)
2019-07-13 19:57:42
Due to biginteger fuck use python first i got wa using biginteger
2019-04-17 00:09:56
C++ Boost Library + Bottom up
2018-03-24 20:48:46
easy dp problem but my mind whirled around when i saw the answer for n=10000 :P
2018-01-04 19:07:19
python rocks!!
2017-07-08 13:50:31 Rakend Chauhan
big integer really not likes me :(
2017-06-13 15:19:25
BigInteger Rocks!!
2017-03-28 08:16:23
5 lines in Python.
YES.
F-I-V-E LINES!
2017-02-25 20:45:54 mukul arora
Python would be good.
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