Kritika visits a aquarium and is astonished to find that the sections of aquarium are numbered in a different way.

First Section  : -1

Second Section  :  1

Third Section  : 16

Fourth Section  : 60

She realized that there is a pattern in the numbering. Help her in guessing the number of "nth" section.

** Input :**
67438

NOTE : You do not need to create a program for this problem you have to write your answers of given input in given code snippet
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SAMPLE INPUT
5

SAMPLE OUTPUT
155
print 5170862977916541521