import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        int num=89760;
        int sum=0;
        while(num>0){
            sum=sum+num%10;
            num=num/10;
        }
        System.out.println(sum);
    }
}