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RGB7606 - Фибоначчийн n дахь гишүүн

F1=1, F2=1, Fn=Fn-1+Fn-2 томьёо өгөгдсөн бол n-р гишүүнийг ол.

Input

Натурал тоо өгөгдөнө. 1<=n<=45.

Output

Fn

Example

Input:

3

Output:

2


Нэмсэн:Bataa
Огноо:2013-01-24
Хугацааны хязгаарлалт:1s
Эх кодын хэмжээний хязгаарлалт:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Програмчлалын хэлүүд:ADA95 ASM32 BASH BF C NCSHARP CSHARP C++ 4.3.2 CPP C99 CLPS LISP sbcl LISP clisp D ERL FORTRAN HASK ICON ICK JAVA JS-RHINO JULIA LUA NEM NICE OCAML PAS-GPC PAS-FPC PERL PHP PIKE PRLG-swi PYTHON PYPY3 PYTHON3 RUBY SCALA SCM guile ST TCL WHITESPACE

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