DMCA
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.
The input contains a single integer $a$ ($1 \le a \le 1000000$).
Output the result – an integer number.
Input
The input contains a single integer $a$ ($1 \le a \le 1000000$).
Output
Output the result – an integer number.
Samples
1
1
81
9