import java.util.Scanner;
public class Main {
    public static void main(String args[]) {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        long sum=0;
        for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        }
            
        if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        }

    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String args[]) {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        long sum=0;
        for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        }
            
        if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        }

    }
} Main public static void main(String args[]) {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        long sum=0;
        for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        }
            
        if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        }

    } main {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        long sum=0;
        for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        }
            
        if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        }

    } Scanner s=new Scanner(System.in); s new Scanner(System.in) String str=s.next(); str s.next() s.next s long sum=0; sum 0 for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        } int i=0; int i=0; i 0 i<str.length() i str.length() str.length str i++ i++ i {
            int num=str.charAt(i)-'0';
            sum+=num;
        } {
            int num=str.charAt(i)-'0';
            sum+=num;
        } int num=str.charAt(i)-'0'; num str.charAt(i)-'0' str.charAt(i) str.charAt str i '0' sum+=num sum num if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        } sum%9==0 sum%9 sum 9 0 {
            System.out.print("Yes");
        } System.out.print("Yes") System.out.print System.out System System.out "Yes" {
            System.out.print("No");
        } System.out.print("No") System.out.print System.out System System.out "No" String args[] args public class Main {
    public static void main(String args[]) {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        long sum=0;
        for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        }
            
        if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        }

    }
} public class Main {
    public static void main(String args[]) {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        long sum=0;
        for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        }
            
        if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        }

    }
} Main
import java.util.Scanner;
public class Main {
    public static void main(String args[]) {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        long sum=0;
        for(int i=0;i<str.length();i++){
            int num=str.charAt(i)-'0';
            sum+=num;
        }
            
        if(sum%9==0){
            System.out.print("Yes");
        }
        else{
            System.out.print("No");
        }

    }
}