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.io.*;
public class MyClass {
    static PrintWriter w;
    
   
    public static void main(String args[]) {
      
        Scanner sc = new Scanner(System.in);
         w=new PrintWriter(System.out);
        
    //     int test=Integer.parseInt(sc.nextLine());
        
    //   A: while(test-->0){
      String s = sc.nextLine();
      int ans = util(s);
      while(ans>9){
          ans=util(new String().valueOf(ans));
      }
       w.println(ans);
      
     //  }
       
        w.flush();
        w.close();
    }
 
 static int util(String s){
     int ans=s.charAt(0)-'0';
     int i=0;
     int n=s.length();
     while(++i<n){
         ans+=s.charAt(i)-'0';
     }
     
     return ans;
     
 }
 
 
}