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.io.*;

public class B_DMCA {

    public static void main(String args[]) throws NumberFormatException, IOException{
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        int n =Integer.parseInt(br.readLine());
        while(n/10!=0) {
        	int ans=0;
        	while(n!=0) {
        		ans+=n%10;
        		n/=10;
        	}
        	n=ans;
        }
        
        System.out.println(n);
    }
}