import java.util.Scanner;

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

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