    .   , 
     ,     
 1-  2- .

 
      N,    ,
   - .   -   0  100. 
1<=N<=100.

 
     .

  
3
1 2 3
4 5 6
7 8 9

11 12 13
14 15 16
17 18 19

  
12 14 16
18 20 22
24 26 28
