Masala #F

Xotira 16 MB Vaqt 1000 ms
14
Muallif: Ds_FoRResT

Ketma ketlik math

Ketma ketlikning n-hadini toping.
0, 7, 26, 63, 124, 215, ... 


Kiruvchi ma'lumotlar:

Bitta qatorda n natural soni. ( 1 <= n <= 20 ) 


Chiquvchi ma'lumotlar:

Bitta qatorda ketma ketlikning n-hadini chiqaring.


Misollar
# input.txt output.txt
1
1
0

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