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 DMCA
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		int num = input.nextInt();
		int remainder = num%9;
		if(remainder == 0)
			remainder = 9;
		System.out.println(remainder);
	}
}