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.Scanner;

public class DMCA {
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        int x=sc.nextInt();
        System.out.println(addd(x));
    }
    public static  int add(int x)
    {
        int result=0;
        while(x>0)
        {
            result+=x%10;
            x=x/10;
        }
        return result;
    }
    public static int addd(int t) {
        while(t >= 10) {
            t = add(t);
        }
        return t;
    }
}