import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }





    }







} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }





    }







} Main public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }





    } main {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }





    } BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String s=br.readLine().trim(); s br.readLine().trim() br.readLine().trim br.readLine() br.readLine br long res=0; res 0 for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        } int i=0; int i=0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        } {
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        } res+=(Integer.parseInt(String.valueOf(s.charAt(i)))) res (Integer.parseInt(String.valueOf(s.charAt(i)))) Integer.parseInt Integer String.valueOf(s.charAt(i)) String.valueOf String s.charAt(i) s.charAt s i if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        } res%9==0 res%9 res 9 0 {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }





    }







} public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }





    }







} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine().trim();
        long res=0;
        for(int i=0;i<s.length();i++){
            res+=(Integer.parseInt(String.valueOf(s.charAt(i))));
        }
        if(res%9==0){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }





    }







}
