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 {
	public static void main (String[] args) throws Exception {
		//code
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

		//int t=Integer.parseInt(br.readLine());

		//while(t-->0)
		//{
/*
		    String line=br.readLine();
		    String[] strs=line.trim().split("\\s+");
		   
*/
		//}
		long n=Long.parseLong(br.readLine());
		
		long ans=0;
		while(n>0)
		{
		    ans=ans+n%10;
		    n=n/10;
		}
		while(ans>=10)
		{
		    n=ans;
		  ans=0;
		while(n>0)
		{
		    ans=ans+n%10;
		    n=n/10;
		}   
		}
		System.out.println(ans);
	}
}