import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int ans = a%10 + (a/10)%10 + a/100;
        System.out.println(ans);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int ans = a%10 + (a/10)%10 + a/100;
        System.out.println(ans);
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int ans = a%10 + (a/10)%10 + a/100;
        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int ans = a%10 + (a/10)%10 + a/100;
        System.out.println(ans);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int ans = a%10 + (a/10)%10 + a/100; ans a%10 + (a/10)%10 + a/100 a%10 + (a/10)%10 + a/100 a%10 a 10 (a/10)%10 (a/10) a 10 10 a/100 a 100 System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int ans = a%10 + (a/10)%10 + a/100;
        System.out.println(ans);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int ans = a%10 + (a/10)%10 + a/100;
        System.out.println(ans);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int ans = a%10 + (a/10)%10 + a/100;
        System.out.println(ans);
    }
}
