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.*;
public class Main
{
	public static void main(String[] args) 
	{
		Scanner sc=new Scanner(System.in);
		int t,n;
		t=sc.nextInt();
		while(t>9)
		{
		    int temp=t;
		    int sum=0;
		    while(temp>0)
		    {
		        sum+=temp%10;
		        temp/=10;
		    }
		    t=sum;
		}
		System.out.println(t);
	}
}