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.*;
import java.lang.*;
import java.io.*;

public class Main
{
	 static int sum(int n){
	 	int res=0;
		while (n>0){
			res+= n%10;
			n/=10;
		}
		return res;
	}
	
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner c=new Scanner(System.in);
			int no=c.nextInt();
			int temp = no;
		 while(temp/10>0)
		    temp=sum(temp);
		System.out.println(temp);
	}
}