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.*;
public class MyClass {
    public static void main(String args[]) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        int sum = 0;
        for(char ch: s.toCharArray()){
            sum += ch - '0';
        }
        while(sum > 9){
            int temp = 0;
            while(sum > 0){
                temp += sum%10;
                sum /= 10;
            }
            sum = temp;
        }
        System.out.print(sum);
    }
}