import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//String t = sc.next();
		//long n = sc.nextLong();
		//long m = sc.nextLong();
		//long k = sc.nextLong();
		//long count=0;

		/*for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count++;
			}else if(i!=2){
				count=0;
			}
		}*/
		/*if(n*m<=k) {
			System.out.println(n*m);
		}else{
			System.out.println(k);
		}*/
		System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)));
	}
}

 import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//String t = sc.next();
		//long n = sc.nextLong();
		//long m = sc.nextLong();
		//long k = sc.nextLong();
		//long count=0;

		/*for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count++;
			}else if(i!=2){
				count=0;
			}
		}*/
		/*if(n*m<=k) {
			System.out.println(n*m);
		}else{
			System.out.println(k);
		}*/
		System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)));
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//String t = sc.next();
		//long n = sc.nextLong();
		//long m = sc.nextLong();
		//long k = sc.nextLong();
		//long count=0;

		/*for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count++;
			}else if(i!=2){
				count=0;
			}
		}*/
		/*if(n*m<=k) {
			System.out.println(n*m);
		}else{
			System.out.println(k);
		}*/
		System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)));
	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//String t = sc.next();
		//long n = sc.nextLong();
		//long m = sc.nextLong();
		//long k = sc.nextLong();
		//long count=0;

		/*for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count++;
			}else if(i!=2){
				count=0;
			}
		}*/
		/*if(n*m<=k) {
			System.out.println(n*m);
		}else{
			System.out.println(k);
		}*/
		System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)));
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3))) System.out.println System.out System System.out Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)) Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)) Integer.parseInt(s.substring(0,1)) Integer.parseInt Integer s.substring(0,1) s.substring s 0 1 Integer.parseInt(s.substring(1,2)) Integer.parseInt Integer s.substring(1,2) s.substring s 1 2 Integer.parseInt(s.substring(2,3)) Integer.parseInt Integer s.substring(2,3) s.substring s 2 3 String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//String t = sc.next();
		//long n = sc.nextLong();
		//long m = sc.nextLong();
		//long k = sc.nextLong();
		//long count=0;

		/*for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count++;
			}else if(i!=2){
				count=0;
			}
		}*/
		/*if(n*m<=k) {
			System.out.println(n*m);
		}else{
			System.out.println(k);
		}*/
		System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)));
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//String t = sc.next();
		//long n = sc.nextLong();
		//long m = sc.nextLong();
		//long k = sc.nextLong();
		//long count=0;

		/*for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count++;
			}else if(i!=2){
				count=0;
			}
		}*/
		/*if(n*m<=k) {
			System.out.println(n*m);
		}else{
			System.out.println(k);
		}*/
		System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)));
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//String t = sc.next();
		//long n = sc.nextLong();
		//long m = sc.nextLong();
		//long k = sc.nextLong();
		//long count=0;

		/*for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count++;
			}else if(i!=2){
				count=0;
			}
		}*/
		/*if(n*m<=k) {
			System.out.println(n*m);
		}else{
			System.out.println(k);
		}*/
		System.out.println(Integer.parseInt(s.substring(0,1))+Integer.parseInt(s.substring(1,2))+Integer.parseInt(s.substring(2,3)));
	}
}


