import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        String [] strArray = s.split("");
        int sum = 0;

        for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        }
        
        System.out.println(sum);

    }
} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        String [] strArray = s.split("");
        int sum = 0;

        for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        }
        
        System.out.println(sum);

    }
} Main public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        String [] strArray = s.split("");
        int sum = 0;

        for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        }
        
        System.out.println(sum);

    } main {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        String [] strArray = s.split("");
        int sum = 0;

        for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        }
        
        System.out.println(sum);

    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String s = scan.next(); s scan.next() scan.next scan String [] strArray = s.split(""); strArray s.split("") s.split s "" int sum = 0; sum 0 for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        } int i = 0; int i = 0; i 0 i < strArray.length i strArray.length strArray strArray.length i++ i++ i {
            sum = sum + Integer.parseInt(strArray[i]);
        } {
            sum = sum + Integer.parseInt(strArray[i]);
        } sum = sum + Integer.parseInt(strArray[i]) sum sum + Integer.parseInt(strArray[i]) sum Integer.parseInt(strArray[i]) Integer.parseInt Integer strArray[i] strArray i System.out.println(sum) System.out.println System.out System System.out sum String[] args args public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        String [] strArray = s.split("");
        int sum = 0;

        for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        }
        
        System.out.println(sum);

    }
} public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        String [] strArray = s.split("");
        int sum = 0;

        for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        }
        
        System.out.println(sum);

    }
} Main
import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        String [] strArray = s.split("");
        int sum = 0;

        for (int i = 0; i < strArray.length; i++) {
            sum = sum + Integer.parseInt(strArray[i]);
        }
        
        System.out.println(sum);

    }
}