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));

           Long n=Long.parseLong(br.readLine());
		
		while(n>=10)
		{
		    int ans=0;
		    while(n>0)
		    {
		        ans=ans+(int)(n%10);
		        n=n/10;
		    }
		    n=(long)ans;
		}
		System.out.println(n);
      }
	}