|April Fools Day Contest 2021|
Many people are aware of DMCA – Digital Millennium Copyright Act. But another recently proposed DMCA – Digital Millennium Calculation Act – is much less known.
In this problem you need to find a root of a number according to this new DMCA law.
The input contains a single integer $$$a$$$ ($$$1 \le a \le 1000000$$$).
Output the result – an integer number.