B. DMCA
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

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

The input contains a single integer $$$a$$$ ($$$1 \le a \le 1000000$$$).

Output

Output the result – an integer number.

Examples
Input
1
Output
1
Input
81
Output
9