Description: 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. Input Format: The input contains a single integer $$$a$$$ ($$$1 \le a \le 1000000$$$). Output Format: Output the result – an integer number. Note: None