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.*;
import java.lang.*;
import java.math.BigInteger;
import java.util.*;
import java.io.*;
import java.util.*;
public class Main{
	static Scanner scanner=new Scanner(System.in);
	public static void main(String[] args) {
		int n=scanner.nextInt();
		int ans=n;
		while(n>=10) {
			ans=0;
			while(n>0) {
				ans+=n%10;
				n/=10;
			}
			n=ans;
		}
		System.out.println(ans);
	}
}