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.util.*;
public class Mango {
	
	public static void main(String[] args) throws Exception {
	Scanner sc = new Scanner(System.in);
	long x = sc.nextLong();
	long sum = x;
	while(sum>9) {
		x = sum;
		sum = 0;
	while(x>0) {
		sum+= x%10;
		x = x/10;
	}
	}
	System.out.println(sum);
	}
}