Problem: 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 ≤ a ≤ 1000000).

Output

Output the result – an integer number.

Examples

Input


1


Output


1


Input


81


Output


9

Solution (in JAVA):

Solution:
import java.util.Scanner;

public class AprilFool2021B {
	public static void main(String[] args) {
		Scanner s=new Scanner(System.in);
		
		long n=s.nextLong();
		
		n=n%9;
		
		if(n==0) n=9;
		System.out.println(n);
	}

}