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:
//package codeforce;
import java.util.*;
import java.io.*;


public class Program {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int x = scanner.nextInt();
		System.out.println((x-1)%9 +1);
		scanner.close();
		
		
		

	}

}