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Fie $N$ ($N$ ≤ $1000$) un numar natural. Numim sir _2-3-monoton_ de lungine $N$ un sir $S~1~$, $S~2~$, $S~3~$, ... $S~n~$ format din $N$ elemente ale multimii ${1, 2, ... $N$}$ care verifica urmatoarele doua relatii:

Fie $N$ ({$N$} ≤ $1000$) un numar natural. Numim sir _2-3-monoton_ de lungine $N$ un sir $S{~1~}$, $S{~2~}$, $S{~3~}$, ... $S{~n~}$ format din $N$ elemente ale multimii ${1, 2, ... N}$ care verifica urmatoarele doua relatii:

* $S~i~$ ≤ $S~i+2~$, oricare ar fi $1 ≤ $i$ ≤ $N-2$
* $S~i~$ < $S~i+3~$, oricare ar fi $1$ ≤ $i$ ≤ $N-3$

* $S{~i~}$ ≤ $S{~i+2~}$, oricare ar fi $1$ ≤ $i$ ≤ $N-2$
* $S{~i~}$ < $S{~i+3~}$, oricare ar fi $1$ ≤ $i$ ≤ $N-3$

h2. Cerinta

h2. Exemple

sir23.in

table(example). |_. sir23.in |_. sir23.out |
| 2 | 4 |
| 3 | 9 |
| 5 | 88|

2
 
sir23.out
 
4
 
sir23.in
 
3
 
sir23.out
 
9
 
sir23.in
 
5
 
sir23.out
 
88
 
 
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==Include(page="template/taskfooter" task_id="sir23")==