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){
        try{
        BufferedReader sc = new BufferedReader(new InputStreamReader(System.in));
                BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        int a = Integer.parseInt(sc.readLine());
        a=a%9;
        if(a==0){
            System.out.println("9");
        }
        else{
        System.out.println(a);
        }
        }catch(Exception e){
            return;
        }
    }
}